Operation CHARM
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Cadillac
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1999
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Eldorado Touring V8-4.6L VIN 9
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Repair and Diagnosis
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Instrument Panel, Gauges and Warning Indicators
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Description and Operation
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Instrument Cluster Gauge Operation
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Tachometer (Analog)
Tachometer (Analog)
The engine RPM is obtained via CKT 121 (WHT) from the PCM. The IPC compares the engine RPM data with a calibration table in order to determine the needle position.