The tach on my 1981 34 (with a 3GM yanmar diesel) stopped working shortly after
I boat the boat last year. It was intermittent for a while and then just
stopped altogether.
I used a voltmeter to check the four-prong plug and it looks like there is
juice coming through, so I don't think its a wiring issue. There is a black
ground, a red wire that shows 14 volts with the engine running and two other
wires that show a pulsing pattern on the voltmeter.
I thought it would make sense to swap out the gauge with a new one, but finding
a replacement part seems a bit trickier than I anticipated. There's no part
number on the gauge itself, just some hard to read letters on the back (NS3
with three symbols below) and 1:1 12 v. The front of the gauge reads Nippon
Seiki N-2 and P= 97.
Any suggestions on where to find a replacement gauge and/or other possible
solutions would be appreciated.
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