gauge cluster wiring

[Big-Sexy907]

On my truck, I used the VSS wiring outside the cab on the firewall. Directly into the PCM, like a three way splice.

Art, happen to remember what color the wire was? IIRC I have a purple and yellow twisted pair that on my 1990.

[Chevy-Art]

Those are the colors. One is the low speed and one is the high speed. And they correspond to the low and high speed on the new pcm.

[Big-Sexy907]

Those are the colors. One is the low speed and one is the high speed. And they correspond to the low and high speed on the new pcm.

I should have mentioned I'm using a 4L80E, all I have off the Nelson harness is a single wire for the speedo. I was hoping I could run that wire straight into the cluster with no problem.

[Chevy-Art]

You should be able to. All the calculations are done in the PCM. The PCM gets info from the VSS, and then sends the signal out to the speedo.

[Chevy-Art]

Here is some more good info.
http://www.ls1truck.com/forums/lsx-t...ol-wiring.html