Tachometer woes

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Katica

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Jun 1, 2010
7
Islander Bahama 30 Elk Rapids, MI
On my Islander B30, the tachometer suddenly is reading about half what it should. Otherwise it works fine. I know its off by the sound of the motor and speed of the boat. I thought tach senders either worked or not. Any thoughts or ideas? A replacement tach sender is expensive and I'd rather not buy one as an experiment.
 
Feb 26, 2004
22,759
Catalina 34 224 Maple Bay, BC, Canada
Have you checked the connections at the back of the alternator? (If your tach is alternator driven, that is.)
 
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