Solo,
Gosh, did I ever misunderstand.
I thought that you wanted to learn as you fixed it yourself and were asking how to do that.
In every manual I ever looked in, there was a wiring diagram, as well as bunches of info
on the internet of how people solved wiring problems.

I also thought the wiring was messed up as the result of an engine swap.
Most of the time the stock engine in a stock car with a stock ECU is not messed up
and does not contain hacked wiring.

Trex, I wasn't trying to take away business from you.
I didn't realize that when a person fixed something themselves, that it was
mandatory that the owner create a:
"butt connected, wire nutted, electrical tapped fucking nightmare cluster fuck"

The most trusted professional for electrical wiring is the factory. My imagination says they have unhacked wiring harnesses at the dealer's.

Good luck gentlemen. Solo, keep us posted on what you go through
and what it takes to fix it.-Bob