Not Ranked
First, check that it is properly grounded. The "-" should be connected to a good, solid ground, as well as the case.
I had one SW tach fail, and replaced it. I recently had a problem with the tach (again) but it seemed to be related to having managed to drain my battery---once I recharged the battery with my garage charger the tach worked fine.
DD
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Dangerous Doug
"You're kidding, right?"
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