Tim,
It sounds like a ground issue. The tach worked before and now it doesnt. The other gauges work, but the lights on the these gauges do not. Is this correct?
Find your ground wire that goes to the tach. I would bet it ties in with your gauge lights also, hence the lights aren't working.
Make sure none of your fuses are blown.
Let us know what you find.
__________________
Jay
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