I changed from TBI to TPI on my 89 RS. The car has a 5 speed. The ECM came from a wrecked IROCK with an automatic. My question is where does the factory shift light hook up to the ECM?
ecm 165 maf

 

It is a tan/black wire that goes to pin "A17" of the ECM.

 

might be the same pin as the TCC of the auto

 

That is correct Dave Y. It also branches off to Pin "f" of the ALDL

 

I thought it might be, on my old 89 C1500, I swaped a 700R4 in place on the OE 5 speed, I ran all the wires, got a new chip(same, but w/auto) and when the TCC engaged , the Shift light came on

 

Thanks Guys!

 

why would you want the shift light anyways? mine always comes on. i shift from 1st to 2nd and 1 second later it comes on. its like that in every gear, very annoying. lol if i listend to the light id be in 5th doing 20 mph down mainstreet

 

Kontrax, I may be wrong but the shift light can be programed to come on when I want it to. If not then I can unhook it.

 

not sure on that one. if you do prog it, let me know