Long story short, 85 IROC, with an 85MPH speedometer. i bought a 145 speedo a few years ago, just now getting around to putting it in, this is what I found. Any help would be GREATLY appreciated
edited for clarity:
the speedo is out of the cluster, but the needle isnt at 0MPH, it's sitting around 50MPH

 

Info about cluster and speedo removal below:

https://www.thirdgen.org/forums/faq-...-fix-pics.html

JamesC

 

the cluster is removed, the gauge is removed, but the needle is stuck where it is. thats what im trying to fix

 

You might have mentioned that up front .

EDIT: Ah, the pic. I see.

The needle should respond when you twist the speedo cable input on the backside of the head. If not, the gauge may be defective.

JamesC

 

te speedometer needle moves when i turn the input at the back, but it never bottoms out to 0MPH. I have NO clue. and yes, i plan on doing the odometer roll swap and trip fix as per your write up

 

Another thought: If the needle was ever removed (for whatever the reason) and stuck back on arbitrarily at, say, 50 mph, your issue could be accounted for.

JamesC

 

Unfortunately thats not the case. It was fine (reading properly) before I put it in a box (while still in the cluster with the faceplate attached) a couple years ago. I'm just now getting around to putting it in, and thats how it was. i have absolutely no idea how it happened or how to fix it.

 

I checked out one I had laying around.

It looks like there is a small copper colored spring just behind the faceplate that returns the needle. That may be what is broken.

There is also a larger black disk below that, and that should be attached to the needle directly, while the input shaft indirectly influences the black disk.

 

Thanks! I wasn't too sure about tearin it apart because ! didnt want to break it even more. I will tear my old 85MPH speedo apart and look into that, and see about scavenging my old speedo to make the new one work

 

FYI, I didn't take mine apart, I just looked at it from the side. The spring looks pretty delicate like what you'd see in an old wind up watch.

 

I loosened the faceplate enough to look behind the needle. The delicate looking copper spring appears to be intact. I removed the backhalf of the actaul speedo that holds the gears and whatnot to swap mileage rolls. It returned to 0. I'm thoroughly baffled at this point