It says injector signal. That means nothing to me. Do they mean the injector power? Red wire to the injectors? Ground is switched, so the only one wire I can think of is injector power. Just want to be sure...
I didn't think the guys at n2mb would return my email as fast as they did. But, turns out that wire goes to the switched side of any injector as a rpm reference. I've never seen rpm reference done this way. New to me, but it's what they wanted.