OK, I haven't been able to work on my project for a bit but I am going to try and get the wiring wrapped up.
I can bundle all grounds to one point from the ECU (and sensors that have a ground including shields). From there I can just use one ground (much larger wire) to the chassis? I am no longer using the factory harness which had multiple ground points.
Also, on the factory harness the ignition coil pack ground had a beefier wire that went to the same chassis point as the grounds from the ECU.
Sorry if this is beating a dead horse, I am just making sure I can ground properly and not have noise interference.
Thanks.