Hey guys, Today tried my tiny tach on my boat, a bayliner 1600 (14 ft, 770lb hull) with a 60 hp mercury 2 stroke outboard (210 lbs). With my dad and I, the top speed is 28 mph at 6700 RPM. It is over revving. The prop is stainless steel mercury quicksilver with a 15inch pitch. The blades are...