If I were to run a MegaSquirt or any other aftermarket fuel injection system, what would I need to retain from my factory TPI? I have a whole 89 Trans Am TPI out of the car but tracing down the VATS stuff, various relays, etc. was a pain. Taking the dash out wasn't as much of a pita as I thought at first....but I was curious as to the easiest route. Ideally, I'd like to just keep the fuel injector harness and go aftermarket from there. Thoughts?