The engine computer. ECU engine control unit, ecm engine control module, pcm power control module. Different name for the same part. Older diesels pre engine controlled by a computer got its rpm reading off of the alternator. Post computer gets the Rpm readings front the crank sensor sent to the ecm then to the gauge. If yours is post ecm connect a scan tool to the obd on board diagnostic connector and see if you get a tac reading, if you do the problem is between the computer and the gauge
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1998 Fleetwood American Tradition 40VS
Cummins C8.3 300 HP Mechanical Injection Pump
Allison Transmission
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