Tachometer intermittent

[Toby Miller]

I have a Yannmar 2QM20 on my boat and my tach is very intermittent. In fact lately it doesnt work most of the time. I have traced the wires from the gauge to the alternator and everything is wired tight. Is there anything else I can check? This is a new tach and alternator. Is there a sensor on the engine itself? Thanks,Toby

 

[Dave Snell]

Tach

There is a sensor above the starter. I disconnected this wire cleaned it and tightened the connection and reconnected it. My tach has worked great since. It looked clean when I started but after cleaning a little better it worked. Good Luck...