Got any idea what pin that is?

 

the ecm just outputs the 5v signal. it only monitors the the signal wire. and it all ground through the chassis to the battery. you just need to steal 5v.

 

I was gonna suggest this. Tapping 12volts is fine, but I never liked the idea of taking or sharing five volts with sensors. I know plenty of people are doing it, I'd just make a new source for it was me. Cheap insurance.

 

gm is pretty good about using separate 5v circuits for there sensors. ford on the other hand just splices to 5 or 6 different sensors off of a single circuit.

 

ok where do you guys suggest i get a good switched 12v source from