I bought a 1981 34' with a 3GMD engine a few years ago. The temp warning buzzer works but the gauge has never worked, although it is in place and wired. The Yanmar manual has a section on testing the buzzer sender unit, but I don't see anything about the location of the sender unit for the gauge or how to test it. Looking for any advice on how to approach diagnosing the problem. Is it the same sender unit for both the buzzer and gauge? I haven't spent the time trying to trace all the wiring but was hoping to find something in the manual first about how the gauge is wired. Thanks in advance for any help. Al Serrato1981 C&C 34Senza FineSan Francisco Bay
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