I am switching my entire dash out for the 90-92 style dash in my Camaro. I am running a 90-92 ECM and I have a speed sensor. To make the speedometer work, does it read off of the computer or the Vehicle Speed Sensor (VSS)? Thanks in advance.

 

the computer reads the VSS sensor then send to the dash. so to answer te question, the speedo works off the signal from the computer.

 

Are there any modifications I need to do to the dash to make it work? I know I had to modify my 84 dash harness to work with the 90-92 TPI computer. But now I'm switching over to the 90-92 dash. Any ideas? Thanks.

 

hmm... my '88 p/u seems to go directly to the dash or something.. at least I know to recalibrate for the different tires it was done on the rear of the dash.. also when I run the winaldl it won't show me the speed.. any input on this one?

 

mmmmmmmmmm my 91 bird reads off a set of plastic gears in the tranny tail cone............

 

Hey Jeff The gauges for the 88 to 91 trucks have the vss buffer built into them. The vss signal is first sent to the gauges and from there it is converted to a signal the tbi computer can understand.

As for why winaldl wont display speed for you I would have no idea.

Also if you have not switched to the 91 gauges with a tach. but would like to let me know and I will send you the wire diagram for the swap, it is the easiest swap possible.

 

i could be wrong. i'll check my wire diagrams for my '86 ta. it is electronic speedo.

 

I too have a 90-02 ECM in my car.
I am still running the VSS Buffer box that was stock on my car.
One day I will run it through the ECM since the ECM uses the VSS Data for some things.