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Any ideas why the tach is not working and how might I fix it?

 
Rep Power: 366

mice or squirrels chewing the wiring of the car might be a possible cause.
asking this question without even going to a shop will yield no responses in here, too broad a question.

and yeah, a friend actually had the trouble i mentioned, so it is a true statement.

 
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Have you done any other work? I have seen loose alternator bolts cause this problem.

 
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About 2 months ago I replaced the Alternator. It wasn't charging the battery and the Tach..,
Speedo., Odom.... entire cluster was not working. Once the Alt. Was replaced everything
In the cluster began working again. 2 weeks ago the tach stopped workinging. The needle
does not move off zero.I did not check the bolts, I did check the belt and the belt is tight.

 
Rep Power: 517

Check if it works during a gauge sweep test:

https://www.civicforums.com/forums/p...110-post5.html

Be sure to watch the linked video too.