need tachometer

[cosres]

I have a 1985 mercury 75 hp 2 stroke. I need a tach that will work with this motor. I have bought a teleflex eclipse tach and it will not work. I read the directions for the tack, hooked it up to the wire tach harness and nothing. Power works to move needle to zero, but will not show any rpms. stuck on zero. Any help?

 

[glenn property of pam]

Re: need tachometer

welcome

the tach reads a signal from the motor so maybe its not the tach thats at fault. What voltage does the motor put out when running?

The battery should be around 12.6vdc normal with the engine running above idle the voltage should rise to 13-14.5 volts