Very easy to install, need to wrap at least 4 turns on any spark plug cable and fasten it well against the cable, with motor OFF and while at RPM display adjust the tach to read : 2P-1R, that's 2 sparks per revolution for tach to read correct rpm at any throttle setting. Follow installation procedure that comes with said tach....
My tiller grip has a modified Helms Mate 18" trolling motor extension handle cut to match my particular tiller grip/rear seat distance needs.