I reccently rigged a 78 150 Johnson on my boat and the tach didnt work, I replaced the rectifier and it worked for a while. Now it works about half of the time, sometimes ok, sometimes the needle is jumping around.
The harness and wiring is 100% new, the rectifier is new but the guage looks to be original to the boat (78), could there be any other possible problem than the guage being bad?
The harness and wiring is 100% new, the rectifier is new but the guage looks to be original to the boat (78), could there be any other possible problem than the guage being bad?