Hey everybody,
I just replaced by dash bezel and in the process I had to also replace the printed circuit on the back of the instrument cluster. A friend of mine ended up disconnecting the cluster while troubleshooting it and I didn't see exactly how he did it. To make a long story short, I replaced the printed circuit - turning signals, etc all work, but found out my gas gauge does not after getting the bezel back on. Did I miss a connection on the cluster that he pulled off? Thanks!

did it work before you changed printed circuit?

if so you probably missed a connection

Here is a photo of the back of my cluster if it helps.

The fuel gage is on the left. There are two studs the get grounded to the circuit board.

Thanks guys, the only thing I can think of is that I did not tighten down the nuts on the studs. There isn`t anything that hooks to those studs, right? Otherwise where does the signal come from?

That is correct. The circuit board has the build in signal that is why it need a good connection there. There should be a couple long 1" or so nut that gets screwed on first under the board and the flat nuts and washer that holds the circuit board tight against them to make a good connection.

From the photo you can not see the long nuts.

I tried pulling the gauge cluster out of the dash last night, but the speedo cable speedo cable seems to be stopping me from pulling the plastic panel out. How do I unscrew the cable. My hand would not fit under the gauge cluster. I have already unscrewed the fasteners off the plastic panel, removed the 3 bolts that hold the steering column up. Do I have to remove the vent duct to depopulate the underside of gauge cluster to get my hand in there? Is there a trick to this? My ultimate goal was to change instrument bulbs and check for ground connections.

On my 69, the speedo cable just has a clip that holds it on. Once you pop the clip, it pulls straight off. Good luck, I am having issues with this stage.

before pulling the cluster out, Just reach underneath the dash up behind the cluster and unscrew the speedo cable.

I also can pull the cluster out and the left side pull further out and I can reach in from the left side and behind the cluster. Just depends how tight everything is.

Ok thanks. But I will go ahead and remove the ducting for the driverside vent. I think this is the only way to reach into the pop up clip. I'll let you guys know the outcome. Thanks again.

Good luck. I had to remove the whole dash bezel for what I am doing. What a pain. The worst part is getting the stem for the lights out (and getting it back on). This is round #2 for taking off the bezel on this go-round.

Any tips on getting the nut back on before putting the stem back in would be appreciated. It took 45 minutes and a lot of swearing the last time.

I found the best way to trouble shoot the dash bezel is with the schematic in front of me along with a 9 volt battery, a bunch of alligator clips and a 90 ohm Potentiometer.

I had painted my gauge cluster and nothing would ground correctly. Had to do a bunch of scraping and then it worked like a charm.

Please note: Do not to put voltage across the current gauge. It will peg hard and smoke will come out:)

don't let the smoke out!

I added an extra ground wire to my cluster and solved several issue. One the gas gauge would barely rise above empty with a full tank and second with the headlights on, both signal indicators would flash if you turn either one on.