Gonna post in Phoenix forum also. I have a 2015 250 SHO on a Phoenix 921. My tach has never read right since the boat was brand new. The dealer even put a new one in and it doesn't read right. It's always reading way more RPM then what the motor is running. So any ideas. Phoenix said something about some little switches on the back of the Tach but they wasn't sure which way to switch them for the SHO...any ideas. Thanks