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Tach does not work 1987 GL

(1990 Ford Escort)
in Ritzville, WA on October 22, 2010
Tach does not work 1987 GL
is the intrument panel voltage regulator at issue or a bad tach unit? how to tell which?
\\smile//
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on October 22, 2010
The instrument voltage regulator is for the temp and fuel gauges, the tachometer works off a different circuit. If your temp and gas gauge work then the voltage regulator must be OK. The tach works on a different principle than the temp and gas gauges. The tach unit could be faulty or ther could be a problem with the tach signal from the engine. The DrkGrn/Yel wire at the ignition coil is where the tach sigmal originates.
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on October 22, 2010
Temp & gas work fine; will try to check the DrkGrn/Yel wire. is there a way to use, say a 9V battery and tap the DrkGrn/Yel wire to see if the tach needle bounces? or to wire a circuit to simulate a 500 to-some few thousand rpm 'fake?' signal to test the tach?
[back when I used to make one of those...
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