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A ac tach usually works off the AC signal of the alternator on a bus or truck. The alternator produces AC power that is rectified to make DC current to run the car, truck or bus. There is a TACH terminal or in North American buses more than 10 years old it is called a stator tap. The AC voltage changes speed (frequency) with the engine and the Tachometer reads that as a signal Early or inexpensive ones are actually run on the AC current.
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What causes the tachometer to stop working on a 1991 Acura Legend?
The tachometer cable may be faulty. The tachometer sensor, on the side of the engine might not be functioning properly.
Why won't my 87 acura tachometer work and could it be affected by a bad ignition coil?
A bad ignition coil can cause your 1987 Acura tachometer to quit working. A bad tachometer cable or ground wire can also cause it to quit working.
Why isn't the tachometer your 2002 Chrysler PT cruiser not working?
If it isn't not working, then it must be working properly.
Why isn't the tachometer working on a 1995 Chrysler lebaron?
The tachometer may not be working on a 1995 Chrysler LeBaron because the cable may be bad. Check to ensure the cable is not broken or kinked.
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A wire going to the battery broke off, when it was reconnected the gauges and lights on the gauges start working again, however the speedometer and the tachometer did not operate.
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A blown fuse.
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If the tach wire shorted or melted.
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