Join Date: Jan 2007
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I was looking at buying an aftermarket "Faria" tach (magnetic pickup), as I do not have a stock Yanmar tach (simple panel). I remember reading, on Faria's website, about having to calibrate their tach, by turning an adjustment on the back, (or maybe front), after first selecting how many teeth your flywheel has. (comparing to a handheld tach, for calibration).
I don't know the Yanmar tach at all, but are you sure that there is no adjustment on the tach itself, perhaps on the back of the guage??