Inaccurate tachometer readings

by Tim
(Annapolis, MD)

I recently purchased a used 2002 Searay 230 Bowrider. It has a 6.2 Mercruiser I/O when I start the engine the tach is reading between 3,000 and 4,000 rpm's. I know from the sound of the engine it is actually running somewhere below 1,000 rpm's. Any suggestions where my problem may be?

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