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> Anyone Know What Controls The Tachometer
cltrailer
post Sep 15 2009, 08:22 PM
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Anyone know what is the, so to speak, the sending unit or sensor that sends the signal to the ecm or tachometer. I guess to ask, what senses the rpm of the engine? Is it the crankshaft sensor or camshaft sensor or transmission input sensor or something else.

The reason I ask, the tachometer tends to have a real low reading. approx. 200 rpm at idle and at 55mph it is about 1000 rpm. Car idles terible and I am thinking the sending sensor for the rpm of the engine may have something to do with the rough idle. Thanks.
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ebmf
post Nov 15 2009, 12:55 PM
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dude, it runs off the coil pack, the voltage pulse get sent to the Ecu(computer), then the computer sends a signal to the needle of the tachometer to move.
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