'95 5.7 auto - non working tach & speedo

[EasyHangIt95]

Thank you.( Schurkey)
I just took it out. It surprised me that it just "pops" out. No wires.
I saw a gauge repair kit for 20.00. Six potentiometers are in the kit.
Anyway, I have to find out what do do about the millage on the odometer.
Thanks again.

[Schurkey]

Originally Posted by EasyHangIt95

I saw a gauge repair kit for 20.00. Six potentiometers are in the kit.
Anyway, I have to find out what do do about the millage on the odometer.

Not potentiometers. Stepper motors. Yes, common problem. Not sure how that is going to cause the odometer to malfunction.

You may have more than one problem in that cluster.

[rhandwor]

For this age vehicle you can try getting a returned instrument cluster and pull the odometer out of it this will get it working. At least in Georgia you have to purchase parts from a licensed speedometer shop.

[j cAT]

Originally Posted by EasyHangIt95

Sorry I just saw a post about an IGNITION SWITCH being the culprit.$135.00. I will get it monday if no one tells me not to.
@sierra

on the 95 you may have multiple electrical problems . the ignition switch should be replaced being an item with your vehicle that has drove many nuts. also a cheap part. over 20 years old this is the stuff that will create nasty problems in many areas.

It may not fix all those issues but a good part to start with. if less than 10 years old then I would not say this is not worn out ..

[EasyHangIt95]

Sorry for the delay in responding back.
I was checking ground wires all over the truck. The truck has a plow harness half removed, a trailer harness rusted and some kind of (tow helper/adjuster?? ) electronic box mounted under the steering wheel.

A funny thing happened. I took the instrument cluster out just to see if there was an obvious burnt or broken wire. I started the truck and put a/c on with the gauge cluster out. BUT! when i put the cluster back while the truck was still running, the A/C blower motor went faster!?? WTF
I haven't finished checking all the grounds under the dash yet. Just thought you guys would love to hear such a crazy thing as this happening.
The Ignition switch has to be special ordered and I'm looking into a place that can recondition my cluster. ( maybe the circuit board is bad??)
we'll see what happens.

[rhandwor]

Depending on how thick your wallet is Junk yard parts are the way to go normally they mark them if they don't work return for replacement.

[EasyHangIt95]

HELLO>>>
I would like to give everyone the final solution to my 1995 GMC Sierra V8 5.7 4x4.
FIRST: My problem was SPEEDOMETER NOT WORKING and TACHOMETER NOT WORKING.
PRNDL (light)NOT WORKING.
NOT SHIFTING CORRECTLY.
LOW POWER (feels like BRAKE is on)
I would like to first tell you of the incredible mistake I made testing the fuse box!! What a doozzy. I tested all the fuses on the drivers side door panel THAT WERE THERE!! The #20 fuse was MISSING. (10a trans fuse. RED) Ill get back to that at the end.
I sent the cluster out to be tested for $65.00 then call me. They just replaced bulbs and cleaned it $235.00. It took 20 days to get it back. I put it in and the problems with the Tach and Speedo were still there. (NOW I'M FREAKING OUT)
Then I changed the ignition switch.
I then thought "let me take it for a spin" see what happens. I grabbed the shift lever and tried to put it in drive ( it had been a little shaky) the shift lever assembly cracked. Yay! ($168.00 in Auto Zone but $95.00 on Amazon) THANK YOU!
After I installed these parts but before I put the covers back on, the cluster didn't work . A few minutes of cursing and trowing tools later I started from scratch at the fuse panel. #20 was missing. I put the red 10 amp fuse in and everything on the dash worked.
This was great but.........the best thing was when i took it for a test ride. DAMMMM! It felt like a 350 in a Cavalier!! The power was incredible. Smoked the tires at the first stop sign! I LOVE MY TRUCK!!
Bottom line. If your 1995 GMC V8 has problems with the speedo and tach Check #20 Trans fuse 10 Amp first. Then change the ignition switch.
(E6 Torx socket or 4mm socket will fit over the torx and is needed to remove switch. Two screws)
Thanks for the help everyone.

[j cAT]

your problem as I said before drove many owners nuts because of the ignition switch . this is quite common on these . causes all sorts of weird problems all over the electrical/tranny control systems. more engine power due to higher volts on the ignition etc... on these old vehicles I have even found fuses , that checked out good but under load would have a voltage drop that was a PITA....

[BattleCruiser]

EasyHang, I have '95 Silverado 350 and had same speedo/tach/PRND out last summer. I found quick info. that it was ignition switch, replaced it, along with key cylinder, and it solved issue. Now it is doing it again, less than six months later. Gonna check the fuse. Thanks for all the work and info. on this. Appreciate it!

[Mpowerdog]

Originally Posted by Schurkey

It's broken. Find a competent service facility, and give them money to fix it.

How did you get the 'dumbest' moniker?

[Mpowerdog]

Same as above - '95 Cheyenne, dead speedo, tach, odo, fuse 20 is good, and picking up a book tomorrow; best/most complete one? And, is there an elec schematic here for this vehicle?

[777stickman]

http://alldatadiy.com/

[Schurkey]

Originally Posted by Mpowerdog

How did you get the 'dumbest' moniker?

Thousands of years ago, I was in a "heated discussion" with Somebody Important on this site, regarding daytime running lights on another of my vehicles.

This person decided that anyone who wants do disable them must be insane or stupid or both. Then he made a big point about how he knew how to disable them, but he wouldn't tell me "because it's a safety feature".

I prefer to think that I didn't drink the Cool-Aid. GM has utterly failed to provide me (or anyone else) with any actual scientific evidence that DRLs do a damned thing favorable for "safety" although when I asked, they did send me links to propaganda press releases. Most of the propaganda hinges on "scientific studies" which were NOT peer-reviewed for errors or false assumptions or outright bias, and at any rate they were done in Baltic countries having extreme latitude and therefore much-reduced daylight brightness for much of the year. (So maybe their conclusions could apply to Alaska, but none of the other states. This is being generous.)

Headlights on in the daytime makes as much sense as turning your heater on when it's hot out, or using your windshield wipers when the windshield is already clear.

[Schurkey]

Originally Posted by Mpowerdog

picking up a book tomorrow; best/most complete one? And, is there an elec schematic here for this vehicle?

Genuine GM service manual. Yes, the genuine service manual has a wiring diagram.

The Genuine service manual for my '88 K1500 is a set of perhaps 5 different books, and a few suppliments. It's a heap of paper. No promises on how many volumes the manual is for your vehicle.

[Mpowerdog]

Law here in VA/WV; If we have our wipers on/daylight, lights must be on