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post #1 of 2 Old 08-11-2019, 10:18 AM Thread Starter
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Unhappy tachometer stopped working

The tach on my1987 Daytona ShelbyZ stopped working when I had the cluster out to repair a couple of bulbs. I cleaned the inside of clear plastic and remember turning the tach needle. Now when I start engine needle went to 2200 rpm and stayed there, ever when engine turned off. What did I do ?
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post #2 of 2 Old 08-12-2019, 09:42 AM
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Re: tachometer stopped working

I have had tach issues on and off for 29+ years.

The most common issues are related to cracked solder joints on the PCB, a bad connection between the tach drive module and the PCB or the tach getting spiked electrically and the needle staying in one spot and the tach not functioning which happened to mine once, it fixed itself a couple of weeks later.

My tach stopped working about 12 years ago or so and I could not get it to work again so I installed and aftermarket tach.
A few years ago I removed the cluster to replace the illumination bulbs and while I was there I decided just for giggles I to try removing the tach drive module, cleaning it again and put it back together, when I started the car the tach was working, go figure, now I have two working tachs.

My only advice is to remove the cluster, remove the tach and tach drive module and clean the connections with an acid brush and electrical contact cleaner where they mount to the PCB and put them back in and see what happens.
With the tach drive module spray the connectors on the module with contact cleaner and then remove/install the module a few times and repeat, this will help to clean the terminals.

Any questions/concerns/problems feel free to ask.
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