tach problems

[troyl]

Hey everyone I have a 25' bayliner cuddy cabin 1988 I bought this boat last year and when the motor is running the tach goes all the way over what could be the problem if it is a wire where would i start at tracing it back


Thanks

 

[flargin]

Re: tach problems

Troyl,

likely it is the tach itself, but you can chase the wire to the ignition coil, it gets pulses from there.

Another shot in the dark, there is usually rotate type switch on the back, some people have indicated if you move that back and forth sometimes the work again. This is how you set the number of cylinders, so set it back correctly or it will be way off.