Vintage Tach wiring

blackhawkdc

Petty Officer 3rd Class
Joined
Jul 9, 2005
Messages
83
Hey all, I've got a 1971 Crestliner 14 foot runabout powered by a 1971 Johnson 50 horse twin. I just bought the boat and the tach was not hooked up. There are only two wires coming out of the backof the tach. A yellow wire and a black wire. Where are this wires suppsoed to be hooked up? I assume the black wire goes to ground, but where does the yellow wire go? Thanks and much appreciated for advice.<br /><br />Seth from Minnesota
 
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