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Tachometer not working after instrument panel overhaul

1497 Views 5 Replies 2 Participants Last post by  Louey
I just re-did my instrument panel, because the clock wasn't working. Now that I have everything back together, the tachometer no longer works.

I replaced the ribbon circuit board as a part of the overhaul.

It looks to me like the tach just feeds off the ribbon. I don't see how I could have done anything wrong. I don't see any other connections for the tach. What am I missing?

Where would be the best place to start looking for the problem?

I really don't want to pull the cluster again. That was a bear.
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I'll double check the coil wire. I never disconnected it, so it shouldn't be a problem.

I'll double check the nuts too.
I couldn't find a problem with the tach wiring with the cluster installed. So I pulled it back out tonight. I must have done something wrong when I reassembled the cluster. I should have taken pictures of every nut, washer, lock washer, nylon washer, etc. when I removed it.

Here is a series of pictures that shows how it was installed. Do any of the nuts, washers etc. look out of place?

There's a bunch of pictures. I'd rather show you everything since I have no clue what I did wrong.

Here's a shot of the two nylon washer that I installed between the ribbon and the housing on the 12 volt coil posts:

Some people think a picture is worth a thousand words...;)
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After looking around under the hood and looking through the paper work that came with the car, I found that the car has a MSD ignition (distributor cap and coil). The tach feed comes out of the bottom of the distributor on a green wire. There was a kink in the wire. It fell apart in my hands when I was fooling around with it. I stripped it back and connected it to the tach, like you mentioned above, and it works. So I have to assume that was the problem Now I have to butt splice on to the green wire to get it reconnect. There doesn't seem to be any other way to replace it. But that should work, though it's in a bitch of a place to get to.

This should fix my problem. Everything else checked out. I'll make real sure I get a good ground to the tach back plate too. Just screwing the back plate in doesn't necessarily give you a good ground, or so my meter says.

Back to the garage...
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