I have a 1988 Iroc-Z TPI T5 car that I'm retrofitting with a T56. The '88 has cable driven speedo and the T56 provides electronic output. I've purchased a new set of electronic gauges to replace the stock cluster. But I've read that some, if not all, require a speed signal to the ECM. The write up on VSS sensors over at JTR touches on a lot of GM vehicles from the 80's and 90's but doesn't actually address my '88.

So, does anyone have a definitive answer whether I need to provide a massaged VSS signal directly to the ECM on my car? I want everything to function properly. Thanks in advance.

 

bump for help

 

I posted response on your other thead.

 

isnt there a wire hanging off the trany thats for that ???

 

a wire hanging off the T-5 or the T56? if there's a wire hanging off the T5 that routes to the ecm, i guess i don't know about it. can anyone enlighten me?