OK 68 Starcraft 20 foot Suncruiser 160 hp Mercruiser I/O. Tach seems correct , GPS confirms speed but does a few miles per hour over the tach reading seem right e.g 1500 rpm is 16 mph and the old girl is singing at 25/2600 doing 30MPH. Not over reving just buzzing and smooth. Admitted i have no idea what prop is on it although its not huge. No stamping on it. Just putting it out there, the old straight six seems happy. Just not sure im not over revving the girl when i stretch her out a bit.
