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Old 04-11-2015, 08:41   #1
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Join Date: Dec 2011
Location: Punta Gorda, FL
Boat: 1983 31' Hunter
Posts: 68
Yanmar 2gm tach problems

I need help! I have a 1983 Hunter w/yanmar 2 gm. the previous owner changed the altrnator to a 105 amp model and the tach is reading WAY off. A top end it is reading 1300-1500 RPMs although when checked with a manual tach it read 3200 RPMs. How do I correct this problem? Or do I just 2X the guage and live with it? I looked on the back of the tach are doesn't appear to be any kinda adjustment. Please help and thanks beforehand.
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2gm, yanmar

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