I bought a complete 140mph/8K RPM tach cluster on eBay. I'm going to use it to replace my current 120mph/6K RPM cluster that is in my 92 GTA.

Here's my problem; I just removed my 120 cluster and on the label attached to the bottom of the fixture is say "8CYL", good so far right. Well the cluster I got off of eBay says "6CYL" on the bottom What gives????? Will it still work? Here is exactly what they say:

140mph/8K RPM Cluster Label:

ZGB
25081623
257400-0230
6CYL LB-8

120mph/6K RPM Cluster Label:

ZCA
05089620
8CYL
257500-5490


Will the 140 cluster still work just fine in my GTA????? I mean correct me if I'm wrong, but wasn't the only V6 to get a 140 speedo the 89 TTA and this one isn't from a TTA! Did someone simply swap the face of the speedo and tach? Can I just put my tach in the 140 cluster? Is this the correct cluster after all?? What do I do?????

Thanks!

 

Well I finally got it all working correctly. It turns out that the new cluster was a pre 1990 anyway that was missing the airbag idiot light. I went ahead and simply removed the 140 speedo and 8K tach from it's housing and put them in my 120 housing after swapping the odometer to that my milage is correct. Now everything seems to be working just fine although I haven't driven it yet to confirm the speedo works.

Anyway I have 1 final problem. Looking at the new cluster, the needle for the speedometer is a lighter shade of orange than the other guages and it bugs the hell out me now.

Is it possible to swap the needles on the speedos? How do you do that?

Thanks!

 

you can paint em with like testors model paint. like flourescent orang or red. just a thought

 

Yeah I don't want to do anything like that though.

I was reading some old posts and it looks like I can remove the 2 screw holding on the face of the speedo and pull off the face which will put even pressure on the center of the needle and safely pop it off. The problem will be putting on the new needle EXACTLY at 0 otherwise I will have to recalibrate it...

 

recalibration is pretty easy once you can understand it. there are three ways that i have observed.

1. leave your dash in shambles and drive around. when stopped at a red light observe the position of the needle and move it to 0.

2. leave dash in shambles and drive along side of someone matching their speed and ask how fast they are going, reset needle as needed.

3.put your car on jackstands and make sure it is sturdy. turn on ignition and keep tach between a set of rpms. observe the position of the needle (this is before you take it off to swap it) then power down the car, remove the needle, power up the car repeat the same step with the teach and put the new needle where the old needle should be. (does that make sense? it seems liek too much work to me just for accurate speedo readings)

 

Exactly, last night I thinking why can't I just drive and when stopped, re-install the needle to the 0 posistion....

Thanks for confirming my idea!

 

I used a fork to remove the needle and swap them and it turns out it reads EXACTLY as it did before, talk about lucky!

Another project finished

 

Good work!