Hi all!! Looking for some help or places to get information. I have a 1986 Trans Am came out with TPI 305, but when I purchased it 350 carburated. Through the years of miscellaneous owners the wiring harness has been cut to pieces i.e. plugs for a/c, & sending units gone(cut off) etc. Okay, I installed a different carburated engine with a 350 transmission and want to get the factory electronic speedometer to work; never has worked since I have owned it. Thanks for any help. Cheers...

 

The VSS on a Pontiac is mounted at the transmission. Make sure it is connected to the speedometer, and that the VSS buffer module for the ECM isn't shorting the signal to the speedo head.

 

Check out http://www.hioutput.com/tech/speedo.html I am in the same situation. What did you mean by the ecm shorting to the speedo head?

 

Thanks for the link andys86ta.