They can go bad, yes. And some are know to be more accurate than others. If we have GPS speed, a known pitch & gear ratio that kinda leaves the tach in question.
Putting the jack plate on this weekend. New tac in the mail. Dont know if I will get it this weekend. But I will have the plate. How high do I jack it up. I have a water pressure guage. When do you stop jacking it up? When you start to lose water pressure?
Went for a test drive. With 2 people and all of my fishing gear 5500 rpms. Thats with a new tac and the jack plate installed. I jacked the motor up untill I started to loose water pressure then went back down 1/2 inch. 5500 is trimed as far as I can go with out cavation with very little waves. Do I need to go to a 13 pitch prop?
