We just did this with a 99 Johnson 30 hp.You"ll need a flywheel with teeth-starter-battery cables-push start button.Pullstart would'nt work with flywheel with teeth,eliminated it. Had choice of filling pull start hole or going to a remote style hood with no hole.Drilled a hole for button on tiller side corner making it user friendly.Have a friend with 30 yrs exp and parts for omc making it reasonable.They tell me dealers sell the kit for $500 depending on year and weather or not you need flywheel,older motors have flywheel with teeth even on pullstarts.