I have an 81 Vector with a 115 Merc turning a 23 pitch ss prop. (It's the white w/ blue chines one used in the old sales brochures). I'm questioning the accuracy of the speedo. Does anyone have a chart or graph showing the relationship of pressure in the pick up line to the reading on the speedometer?Thanx, Rick S.
used to have a chart that gave the pressure to mph numbers but I lost it
somewhere. Medallion instruments published it and if I remember 100 psi
was 88 mph. I'll try to obtain one and post it here.
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