Odometer repair?

[pvt num 11]

Okay, before I crack open my dashboard and rip the cluster out - my speedometer works, but the odometers do not. Probable causes could be the odometer motor or geartrain, correct?

Anybody ever had to deal with this?

I have a donor gauge cluster from a 1989 Firebird, and the mileage is almost exactly the same, but the speedometer is a 120 unit, versus our 140 units. I'm a bit reluctant to remove an odometer unit out of a cluster and end up picking up millions of little plastic bits.

[Jan Larsson]

I had the same on mine, the small motor in there where dead ... you can replace just the motor (which I did from another cluster I had) wihtout reseting the milage or anything so I would go for that first and see if it takes care of the problem.

[fast400]

...leave it! You'll always have a low mileage TTA

[pvt num 11]

Eh, the worm gear stripped out the drive gear in the cluster. Swapped the faceplate and the electronics board but I kept the donor gauge and odometer gearing - and the mileage - so I should find out shortly if I really do sixty when it says sixty. The wife is going to follow me and report how I do. At least it all works, but I think I bumped the left turn indicator bulb, as it no longer lights up. Drat - next time, I'll ensure all indicators work BEFORE screwing everything back together...

On an unrelated note, i failed my safety check (duh, I have no plates) but I also need rear tires. I'm thinking about staying with the BF Goodrich T/A KDW ones, even though they're pricey!

[fast400]

If the wife doesn't have time, just use the scanmaster mph output to compare while your driving.
Bob

[pvt num 11]

Ah, a most excellent idea. Just one more reason to hook it up...!

[Razor]

FWIW.. the speedo on the tta is an electronic speedo. Meaning it works of the VSS. So if the VSS says 60 MPH.. then the speedo and ecm and cruise control are all seeing 60 MPH. The only way the speedo would be wrong, is if you pulled the gear off of the VSS and swapped it for a different pitch or changed the tire height.

HTH

[pvt num 11]

Well, I had to pull the needle off to swap the face - so I'm basically all I need to see is if the needle is on the gauge correctly. And, looking at the two PCB's, one of the IC chips is different and a few resistors are of different values - probably becasue one was a 120 and the other as a 140, with the same swept area under the gauge. Wish I had taken pictures of the TTA PCB when it was still out... So yeah, I see you point about the VSS gearing, as I didn't change any of that, but I found that even though the actual gauge itself is the same, the circuit card isn't. Not wanting to chance it, I reused the original one.

[BandAid]

Originally Posted by pvt num 11

Wish I had taken pictures of the TTA PCB when it was still out...

Umm I wish you did also,would like to see the plugs in the back ....