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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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