Hello my name is Tim. Im in need of some help. I apologize if this is not the right place.
So my father in law had his boat restored at a local marina and they replaced the guages on the dash. The tach they installed is a sierra 68399p. The problem is the motor is a 1986 force 125hp. It has a 20 pole stator. The Guage says to take the number of poles and divide it by 2 and adjust the tach to that number. The tach only has options from 2 to 6. I currently have it set on 5 and the tach reads double the RPM. Is there a way i can make a circuit to divide the number of pulses to get this to display correctly?
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