Sierra MP39760 Ignition Switch for JohnsonEvinrude Outboards 3 Position Magneto Sierra MP39760 is a replacement ignition switch for JohnsonEvinrude Outboards. Push to choke Maximum corrosion protection - eliminates oxidation Inner seal between cylinder lock and contact plate Non-conductive housing eliminates potential shorts Specifications Back Up Nut Plastic Face Nut Hex Black Plastic Hole Size 78 Length Short 58 maximum panel thickness Material Marine grade glass-filled Polyester Rated Choke 7