I have a 1984 19ft hydra-sport (hull weight only 1000lbs not including motor) with the 01 vmax on it now. Im only getting 47mph (gps) and I really can't lift the hull out of the water with trim.(it kinda just blows water out to the side of the prop, not normal like rooster tail)

84 hydra-sport 19ft
yamaha 150 Vmax 2001

Trying to figure out what's wrong with rpm gauge, bought a brand new and its now working.