Cummins Marine Diesel Repower Specialists Forums Instrumentation & Electronics Cummings 210HP Twin engine; RPM tachometer

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    Klaus Scheckel
    Participant
    Vessel Name: Time Out
    Engines: 2 Cummings diesel 210
    Location: Perth
    Country: Australia

    HI everyone, I am pretty much new to power boating; so you can guess I do not know much about engines and instrumentation. Everything was running smoothly until I had my engines serviced. When I start them the RPM tachometer for one engine fluctuates wildly from 600 to 2000 RPM, also under load. The engine runs fine.
    I have ruled out a faulty tachometer because the one in the boat and the one on the flybridge are doing the same thing. Has anybody an idea why this is happening?

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