I have a 1993 60HP Evinrude Tiller. I do not have a console but do have room on the side of boat where switches are to install one. I can't seem to find a tach for this 3 cylinder. Would like to know the rpm's with this 13 3/4 X 15 prop. Might need to change for top end. Right now I pop out of the water like a cork. What should a marina charge to do this?