wiring gen3 duster

Be careful of grounding. Unfortunately the "chopped up" nature of current service manuals makes it more difficult to "view" the big picture of a harness. But you don't want to just slop the computer / harness grounds down "anywhere" you can generate what is known as a ground loop, and introduce unwanted noise/ false triggers, etc, there are several issues. In other words try and research the original harness and duplicate that. If nothing else, run a dedicated ground of sufficient size clear to the battery. If the harness / computer EG uses say, a no14 for that ground, and you need to lengthen, I'd use at least 10 from there. Run the grounding wire close to the firewall / other body metal to sort of "shield" it. (Ground plane)

For electronics, it would be best to visualize a "single point ground."