Hello I just bought a 2001 Wellcraft Excalibur 23 with a Volvo 7.4GI, SX drive 1.43 ratio, it has a 19 pitch 3 blade prop on it. Took it out and this is what I saw, at WOT tach showed 3300 rpm trimmed out, but my GPS speed was 53.4 mph. One time after restarting the engine, I noticed the tach...
