i have a 1989 winner 1660 tournament bass boat with a 85 johnson without power tilt and trim will the smart tabs be worth the added expense and what will be the benefits? and my other question is the smart tabs goes right where my speedometer pickup is (the white thingy). how far can i move the speedo pickup towards the center of the boat and still get proper readings? and will the speedo still work without getting cavitation from the motor or from the smart tabs??????????????????????...............Mike