Yamaha 704 tach wiring

Adam Conter

Recruit
Joined
Jun 9, 2019
Messages
2
Just got a new analog tac to go on my boat. I have a f90ja Yamaha with a 704 single binnacle control I was wondering if anyone has a diagram of how to wire the tach in and what pol I should set it on
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,758
+12 on the tach can connect to the +12 terminal on any other gauge. Same for the ground, and same for the internal light. The "S" terminal on the tach is the "signal" wire coming from the engine. I'm not familiar with Yammy wiring so someone else will help with that. Very likely the tach should be set to 6P.
 
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