12v Charging outlet
John, I think you have a 12v outlet for charging trolling batt's?? (My 7 1/2 honda does) Anyway if it does you could mount a standard 12v hr meter at the transom and use the plug supplied with motor to plug it in.. because it doesn't have voltage unless the motor is running you may just leave it plugged in all the time and it will record the running time. Also it is DC just like your car, it is rectified ac. Hope this helped? Mike WD9EOU s/v Chute the Breeze C-38 # 169