View Full Version : RPM's are not reading right - advice????

11-10-2005, 01:41 PM
RPM meter appears to be regestering low... For instance the tach reads 2 grand at 30 mph and never gets above 3 grand but the engine sounds to be close to redline... Is this a bad tach or bad wires?

Thank you,
1989 PS190

11-14-2005, 02:48 PM
That's definitely reading low. I think on your motor the tach runs off the positive side of the coil. I would check to make sure all your connections are good, but I suspect you have a bad guage. Hopefully it's a simple, inexpensive fix......but then it is a boat so you know how that goes.