Re: Tachometer not working, help!

["Dave Ewing" <rabbit16v@prodigy.net>]

It's the instrument cluster.  Seen quite a few do it!!  The hitting the dash
and it works is the key symptom.  Pretty easy to fix, just swap clusters!

Dave

>
> On a very hot day, about 10 days ago, my tach did not function when I
> started the car. After driving for 10 minutes I restarted the car a few
> times and the tach started working.
> Since then, it has been intermittent. It may start ok and then wake up
> randomly, then die again, etc.
>
> I disassembled the instr. cluster. Connection from the harness in the
> interior of the car all the way to the pin that gives current to the tach
is
> ok. The printed circuit board of the tach itself looks in good shape, all
> connections are fine, all the way up to the "spring" which actually
rotates
> the tach. Don't know, however, if the circuitry (resistors, capacitors,
and
> inductors) between the signal to the cluster and the signal to the actual
> "spring" is ok, the resistor values seem standard, but I have not way to
> test the capacitors and the inductors. So, that is one possibility, but it
> seems very unlikely, given the intermittent nature of the problem.
>
> Checked the hall sender connection at the distributor and despite some
> amount of oil (which I wiped) it looks ok (have yet to check the
continuity
> between the hall sender connector and the cluster itself).
>
> I believe the problem is close to the cluster --I once slapped the
dashboard
> and the tach started working, too much to be a coincidence.
>
> Any ideas? Anyone have this problem?
>
>
> Thanks,
>
> Elias
>
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