Operation CHARM
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Dodge or Ram Truck
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1992
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D 250 Pickup V6-239 3.9L
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Description and Operation
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Functional Operation
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Inputs and Outputs
Inputs and Outputs
PURPOSE
The engine controller supplies the tachometer with signals that represent engine rpm. These signals are converted to linear motion on the tachometer, this shows the driver the engine rpm.