My tach as recently quit working my speedo has never worked as long as I've had my boat. A friend told me it was probably the rectifier. I've seen what the part looks like, but I don't know where to find it on the motor. Two questions: where is it on the motor, and would this also correct my speedo if I replace it. Thanks for any and all replies, God bless!! My motor is a 2000 ox66 150...