gpfishingdude
Chief Petty Officer
- Joined
- May 1, 2012
- Messages
- 538
I installed a tach. for the 1986 Mercury 50HP motor on the pontoon boat. When we got it on the water I noticed that it was reading way too high. It read 2000 with the motor shut off and was pegging 7000 rpm at cruising speed. Right now it is reading around 900 rpm with the motor off. Can it still be tuned in by adjusting the number of poles on the adjusting screw on the back or have I ruined this tach.? To adjust the number of poles I have to remove the tach. for access to the back of it. I don't understand what the number of poles is about but I'm hoping that it is some form of multiplier?