The speedometer and tachometer stopped working?

ALFARO81

MEMBER
1995 CHEVROLET TAHOE
V8
4WD
AUTOMATIC
211,334 MILES

I recently got my dashboard replaced the plastic on top and a few days later my speedometer and rpms stopped working the other ones work like my gas, temperature, and battery gauge work but just two don’t I tested a bunch of things the VSS, BSS, fuses, relay, check the wires for corrosion and everything else people recommend on forums. Is there anything I could be missing?

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,968 POSTS

I would check the fuses and electrical connectors at the rear of the cluster and if they are okay, I would get a rebuilt cluster and install it, you can get a preprogrammed unit by searching Google or Ebay.

Here is a video that will help:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

https://youtu.be/_HEC44xENxw

Please go over these guides and get back to us.

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Saturday, June 3rd, 2023 AT 10:17 AM

ALFARO81

MEMBER
3 POSTS

I bought two new clusters tested both with ground and both work but as soon as it’s hooked up on to its location the rpm and mph needles don’t move at all I checked every wire there is and fuses all are good my vehicle is gutted out from testing electrical but still can’t seem to find the problem.

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Sunday, June 4th, 2023 AT 7:24 AM

KEN L

MASTER CERTIFIED MECHANIC
42,968 POSTS

That is strange, here is a guide to help you test the wiring connections and the wiring diagrams for the cluster so you can see how it works and which wires to test.

https://www.2carpros.com/articles/how-to-check-wiring

I have seen the vehicle speed buffer cause problems like this as well. Check out the images (below). Please let us know what happens.

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Monday, June 5th, 2023 AT 9:28 AM

ALFARO81

MEMBER
3 POSTS

I just tested all those wires and same thing they are reading when I give ground to the cluster on the rear the needles move but as soon as it’s hooked up, they don’t exact problem on both clusters.

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Tuesday, June 6th, 2023 AT 6:26 AM

KEN L

MASTER CERTIFIED MECHANIC
42,968 POSTS

There must be a problem with the PCM since both of these signals run through it. Here is how to change the unit out, you can get a preprogrammed unit by searching Google or Ebay. Check out the images (below). Please let us know what happens.

Images (Click to make bigger)