diff --git a/mne_bids_pipeline/_config.py b/mne_bids_pipeline/_config.py
index 850599e36..291e63e0b 100644
--- a/mne_bids_pipeline/_config.py
+++ b/mne_bids_pipeline/_config.py
@@ -1105,6 +1105,12 @@
     ```
 """
 
+sync_eyelink: bool = False
+
+remove_blink_saccades: bool = True
+sync_eventtype_regex: str = ".*"
+sync_eventtype_regex_et: str = ""
+
 # ### SSP, ICA, and artifact regression
 
 regress_artifact: dict[str, Any] | None = None
diff --git a/mne_bids_pipeline/steps/preprocessing/_05b_sync_eyelink.py b/mne_bids_pipeline/steps/preprocessing/_05b_sync_eyelink.py
new file mode 100644
index 000000000..136aecf2a
--- /dev/null
+++ b/mne_bids_pipeline/steps/preprocessing/_05b_sync_eyelink.py
@@ -0,0 +1,261 @@
+from types import SimpleNamespace
+import mne
+import os.path
+import re
+import numpy as np
+from mne_bids import BIDSPath
+
+from ..._config_utils import (
+    _bids_kwargs,
+    get_eeg_reference,
+    get_runs,
+    get_sessions,
+    get_subjects,
+)
+from ..._import_data import annotations_to_events, make_epochs
+from ..._logging import gen_log_kwargs, logger
+from ..._parallel import get_parallel_backend, parallel_func
+from ..._reject import _get_reject
+from ..._report import _open_report
+from ..._run import _prep_out_files, _update_for_splits, failsafe_run, save_logs
+
+
+def get_input_fnames_sync_eyelink(
+    *,
+    cfg: SimpleNamespace,
+    subject: str,
+    session: str | None,
+) -> dict:
+    bids_basename = BIDSPath(
+        subject=subject,
+        session=session,
+        task=cfg.task,
+        acquisition=cfg.acq,
+        recording=cfg.rec,
+        space=cfg.space,
+        datatype=cfg.datatype,
+        root=cfg.deriv_root,
+        check=False,
+        extension=".fif",
+    )
+
+    et_bids_basename = BIDSPath(
+        subject=subject,
+        session=session,
+        task=cfg.task,
+        acquisition=cfg.acq,
+        recording=cfg.rec,
+        datatype="beh",
+        root=cfg.bids_root,
+        suffix="et",
+        check=False,
+        extension=".asc",
+    )
+
+
+    et_edf_bids_basename = BIDSPath(
+        subject=subject,
+        session=session,
+        task=cfg.task,
+        acquisition=cfg.acq,
+        recording=cfg.rec,
+        datatype="beh",
+        root=cfg.bids_root,
+        suffix="et",
+        check=False,
+        extension=".edf",
+    )
+
+    in_files = dict()
+    for run in cfg.runs:
+        key = f"raw_run-{run}"
+        in_files[key] = bids_basename.copy().update(
+            run=run, processing=cfg.processing, suffix="raw"
+        )
+        _update_for_splits(in_files, key, single=True)
+
+
+        key = f"et_run-{run}"
+        in_files[key] = et_bids_basename.copy().update(
+            run=run
+        )
+        _update_for_splits(in_files, key, single=True) # TODO: Find out if we need to add this or not
+
+        key = f"et_edf_run-{run}"
+        in_files[key] = et_edf_bids_basename.copy().update(
+            run=run
+        )
+        _update_for_splits(in_files, key, single=True) # TODO: Find out if we need to add this or not
+    
+    return in_files
+
+
+
+@failsafe_run(
+    get_input_fnames=get_input_fnames_sync_eyelink,
+)
+def sync_eyelink(
+ *,
+    cfg: SimpleNamespace,
+    exec_params: SimpleNamespace,
+    subject: str,
+    session: str | None,
+    in_files: dict,
+) -> dict:
+    """Run Sync for Eyelink."""
+    import matplotlib.pyplot as plt
+
+    raw_fnames = [in_files.pop(f"raw_run-{run}") for run in cfg.runs]
+    et_fnames = [in_files.pop(f"et_run-{run}") for run in cfg.runs]
+    et_edf_fnames = [in_files.pop(f"et_edf_run-{run}") for run in cfg.runs]
+    
+    logger.info(**gen_log_kwargs(message=f"et_fnames {et_fnames}"))
+    out_files = dict()
+    bids_basename = raw_fnames[0].copy().update(processing=None, split=None, run=None)
+    out_files["eyelink"] = bids_basename.copy().update(processing="eyelink", suffix="raw")
+    del bids_basename
+
+    
+    
+    for idx, (run, raw_fname,et_fname,et_edf_fname) in enumerate(zip(cfg.runs, raw_fnames,et_fnames,et_edf_fnames)):
+        msg = f"Syncing eyelink data (fake for now) {raw_fname.basename}"
+        logger.info(**gen_log_kwargs(message=msg))
+        raw = mne.io.read_raw_fif(raw_fname, preload=True)
+        if not os.path.isfile(et_fname):
+            logger.info(**gen_log_kwargs(message=f"Couldn't find {et_fname} file, trying to call edf2asc."))
+            if not os.path.isfile(et_edf_fname):
+                logger.error(**gen_log_kwargs(message=f"Also didn't find {et_edf_fname} file, one of both need to exist for ET sync."))
+            import subprocess
+            subprocess.run(["edf2asc", et_edf_fname]) # TODO: Still needs to be tested
+
+        raw_et = mne.io.read_raw_eyelink(et_fname,find_overlaps=True)
+
+        # If the user did not specify a regular expression for the eye-tracking sync events, it is assumed that it's
+        # identical to the regex for the EEG sync events
+        if not cfg.sync_eventtype_regex_et:
+            cfg.sync_eventtype_regex_et = cfg.sync_eventtype_regex
+        
+        et_sync_times = [annotation["onset"] for annotation in raw_et.annotations if re.search(cfg.sync_eventtype_regex_et,annotation["description"])]
+        sync_times    = [annotation["onset"] for annotation in raw.annotations    if re.search(cfg.sync_eventtype_regex,   annotation["description"])]
+
+        assert len(et_sync_times) == len(sync_times),f"Detected eyetracking and EEG sync events were not of equal size ({len(et_sync_times)} vs {len(sync_times)}). Adjust your regular expressions via 'sync_eventtype_regex_et' and 'sync_eventtype_regex' accordingly"
+        #logger.info(**gen_log_kwargs(message=f"{et_sync_times}"))
+        #logger.info(**gen_log_kwargs(message=f"{sync_times}"))
+
+
+        # Check whether the eye-tracking data contains nan values. If yes replace them with zeros.
+        if np.isnan(raw_et.get_data()).any():
+
+            # Set all nan values in the eye-tracking data to 0 (to make resampling possible)
+            # TODO: Decide whether this is a good approach or whether interpolation (e.g. of blinks) is useful
+            # TODO: Decide about setting the values (e.g. for blinks) back to nan after synchronising the signals
+            np.nan_to_num(raw_et._data, copy=False, nan=0.0)
+            logger.info(**gen_log_kwargs(message=f"The eye-tracking data contained nan values. They were replaced with zeros."))
+
+        #mne.preprocessing.eyetracking.interpolate_blinks(raw_et, buffer=(0.05, 0.05), interpolate_gaze=True)        
+
+        
+        # Align the data
+        mne.preprocessing.realign_raw(raw, raw_et, sync_times, et_sync_times)
+
+
+        # Add ET data to EEG
+        raw.add_channels([raw_et], force_update_info=True)
+        raw._raw_extras.append(raw_et._raw_extras)
+
+        # Also add ET annotations to EEG
+        raw.set_annotations(mne.annotations._combine_annotations(raw.annotations,raw_et.annotations,0,raw.first_samp,raw_et.first_samp,raw.info["sfreq"]))
+
+
+        msg = f"Saving synced data to disk."
+        logger.info(**gen_log_kwargs(message=msg))
+        raw.save(
+            out_files["eyelink"],
+            overwrite=True,
+            split_naming="bids", # TODO: Find out if we need to add this or not
+            split_size=cfg._raw_split_size, # ???
+        )
+        # no idea what the split stuff is...
+        _update_for_splits(out_files, "eyelink") # TODO: Find out if we need to add this or not
+
+    
+
+    # Add to report
+    tags = ("sync", "eyelink")
+    title = "Synchronize Eyelink"
+    with _open_report(
+        cfg=cfg,
+        exec_params=exec_params,
+        subject=subject,
+        session=session,
+        task=cfg.task,
+    ) as report:
+      
+      
+        caption = (
+           f"The `realign_raw` function from MNE was used to align an Eyelink `asc` file to the M/EEG file."
+           f"The Eyelink-data was added as annotations and appended as new channels."
+        )
+        fig = raw_et.plot(scalings=dict(eyegaze=1e3))
+        report.add_figure(
+            fig=fig,
+            title="Eyelink data",
+            section=title,
+            caption=caption,
+            tags=tags[1],
+            replace=True,
+        )
+        plt.close(fig)
+        del caption
+    return _prep_out_files(exec_params=exec_params, out_files=out_files)
+
+
+
+
+
+
+def get_config(
+   *,
+    config: SimpleNamespace,
+    subject: str,
+    session: str | None = None,
+) -> SimpleNamespace:
+    #logger.info(**gen_log_kwargs(message=f"config {config}"))
+
+    cfg = SimpleNamespace(
+        runs=get_runs(config=config, subject=subject),
+        remove_blink_saccades   = config.remove_blink_saccades,
+        sync_eventtype_regex    = config.sync_eventtype_regex,
+        sync_eventtype_regex_et = config.sync_eventtype_regex_et,
+        processing= "filt" if config.regress_artifact is None else "regress",
+        _raw_split_size=config._raw_split_size,
+
+        **_bids_kwargs(config=config),
+    )
+    return cfg
+
+
+def main(*, config: SimpleNamespace) -> None:
+    """Sync Eyelink."""
+    if not config.sync_eyelink:
+        msg = "Skipping, sync_eyelink is set to False …"
+        logger.info(**gen_log_kwargs(message=msg, emoji="skip"))
+        return
+
+
+    with get_parallel_backend(config.exec_params):
+        parallel, run_func = parallel_func(sync_eyelink, exec_params=config.exec_params)
+        logs = parallel(
+            run_func(
+                cfg=get_config(config=config, subject=subject),
+                exec_params=config.exec_params,
+                subject=subject,
+                session=session,
+            )
+            for subject in get_subjects(config)
+            for session in get_sessions(config)
+        )
+    save_logs(config=config, logs=logs)
+
+
+
diff --git a/mne_bids_pipeline/steps/preprocessing/_06a1_fit_ica.py b/mne_bids_pipeline/steps/preprocessing/_06a1_fit_ica.py
index 598d2e308..cec972d77 100644
--- a/mne_bids_pipeline/steps/preprocessing/_06a1_fit_ica.py
+++ b/mne_bids_pipeline/steps/preprocessing/_06a1_fit_ica.py
@@ -256,7 +256,8 @@ def run_ica(
         fit_params=fit_params,
         max_iter=cfg.ica_max_iterations,
     )
-    ica.fit(epochs, decim=cfg.ica_decim)
+    # TODO: This works for our pipeline (exclude eye-tracking data for ICA) but probably not in general
+    ica.fit(epochs.pick(picks="eeg"), decim=cfg.ica_decim)
     explained_var = (
         ica.pca_explained_variance_[: ica.n_components_].sum()
         / ica.pca_explained_variance_.sum()
@@ -349,7 +350,7 @@ def get_config(
         eog_channels=config.eog_channels,
         rest_epochs_duration=config.rest_epochs_duration,
         rest_epochs_overlap=config.rest_epochs_overlap,
-        processing="filt" if config.regress_artifact is None else "regress",
+        processing="eyelink" if config.sync_eyelink else "filt" if config.regress_artifact is None else "regress",
         _epochs_split_size=config._epochs_split_size,
         **_bids_kwargs(config=config),
     )
diff --git a/mne_bids_pipeline/steps/preprocessing/_06a2_find_ica_artifacts.py b/mne_bids_pipeline/steps/preprocessing/_06a2_find_ica_artifacts.py
index 43f88032a..63eff384f 100644
--- a/mne_bids_pipeline/steps/preprocessing/_06a2_find_ica_artifacts.py
+++ b/mne_bids_pipeline/steps/preprocessing/_06a2_find_ica_artifacts.py
@@ -365,7 +365,7 @@ def get_config(
         eog_channels=config.eog_channels,
         rest_epochs_duration=config.rest_epochs_duration,
         rest_epochs_overlap=config.rest_epochs_overlap,
-        processing="filt" if config.regress_artifact is None else "regress",
+        processing="eyelink" if config.sync_eyelink else "filt" if config.regress_artifact is None else "regress",
         **_bids_kwargs(config=config),
     )
     return cfg
diff --git a/mne_bids_pipeline/steps/preprocessing/_06b_run_ssp.py b/mne_bids_pipeline/steps/preprocessing/_06b_run_ssp.py
index b17816a7e..f39b3ba98 100644
--- a/mne_bids_pipeline/steps/preprocessing/_06b_run_ssp.py
+++ b/mne_bids_pipeline/steps/preprocessing/_06b_run_ssp.py
@@ -249,7 +249,7 @@ def get_config(
         epochs_decim=config.epochs_decim,
         use_maxwell_filter=config.use_maxwell_filter,
         runs=get_runs(config=config, subject=subject),
-        processing="filt" if config.regress_artifact is None else "regress",
+        processing="eyelink" if config.sync_eyelink else "filt" if config.regress_artifact is None else "regress",
         **_bids_kwargs(config=config),
     )
     return cfg
diff --git a/mne_bids_pipeline/steps/preprocessing/_07_make_epochs.py b/mne_bids_pipeline/steps/preprocessing/_07_make_epochs.py
index 47f717959..a52b3b0fe 100644
--- a/mne_bids_pipeline/steps/preprocessing/_07_make_epochs.py
+++ b/mne_bids_pipeline/steps/preprocessing/_07_make_epochs.py
@@ -335,7 +335,7 @@ def get_config(
         rest_epochs_overlap=config.rest_epochs_overlap,
         _epochs_split_size=config._epochs_split_size,
         runs=get_runs(config=config, subject=subject),
-        processing="filt" if config.regress_artifact is None else "regress",
+        processing="eyelink" if config.sync_eyelink else "filt" if config.regress_artifact is None else "regress",
         **_bids_kwargs(config=config),
     )
     return cfg
diff --git a/mne_bids_pipeline/steps/preprocessing/_08a_apply_ica.py b/mne_bids_pipeline/steps/preprocessing/_08a_apply_ica.py
index 430c4cdd3..2d4d5c78a 100644
--- a/mne_bids_pipeline/steps/preprocessing/_08a_apply_ica.py
+++ b/mne_bids_pipeline/steps/preprocessing/_08a_apply_ica.py
@@ -243,7 +243,7 @@ def get_config(
     cfg = SimpleNamespace(
         baseline=config.baseline,
         ica_reject=config.ica_reject,
-        processing="filt" if config.regress_artifact is None else "regress",
+        processing="eyelink" if config.sync_eyelink else "filt" if config.regress_artifact is None else "regress",
         _epochs_split_size=config._epochs_split_size,
         **_import_data_kwargs(config=config, subject=subject),
     )
diff --git a/mne_bids_pipeline/steps/preprocessing/_08b_apply_ssp.py b/mne_bids_pipeline/steps/preprocessing/_08b_apply_ssp.py
index 6ab00dc12..b3139433c 100644
--- a/mne_bids_pipeline/steps/preprocessing/_08b_apply_ssp.py
+++ b/mne_bids_pipeline/steps/preprocessing/_08b_apply_ssp.py
@@ -149,7 +149,7 @@ def get_config(
     subject: str,
 ) -> SimpleNamespace:
     cfg = SimpleNamespace(
-        processing="filt" if config.regress_artifact is None else "regress",
+        processing="eyelink" if config.sync_eyelink else "filt" if config.regress_artifact is None else "regress",
         _epochs_split_size=config._epochs_split_size,
         **_import_data_kwargs(config=config, subject=subject),
     )
diff --git a/mne_bids_pipeline/steps/preprocessing/__init__.py b/mne_bids_pipeline/steps/preprocessing/__init__.py
index f9072617c..33dc66f8c 100644
--- a/mne_bids_pipeline/steps/preprocessing/__init__.py
+++ b/mne_bids_pipeline/steps/preprocessing/__init__.py
@@ -6,6 +6,7 @@
     _03_maxfilter,
     _04_frequency_filter,
     _05_regress_artifact,
+    _05b_sync_eyelink,
     _06a1_fit_ica,
     _06a2_find_ica_artifacts,
     _06b_run_ssp,
@@ -21,6 +22,7 @@
     _03_maxfilter,
     _04_frequency_filter,
     _05_regress_artifact,
+    _05b_sync_eyelink,
     _06a1_fit_ica,
     _06a2_find_ica_artifacts,
     _06b_run_ssp,