Anyone wanting to use stock guage from apex and Yamaha speed sensor w Yamaha gear, this will work and be within 5mph ,made clutch cover similar to bents and mounted sensor inside cover so gear is on end of secondary, the Yamaha gear has 15 teeth on it and was way off, I took ten teeth off of gear leaving 5 on it spaced evenly, leave 1 tooth take two off, works awesome was within 1 mph of 75 mile ride today comparing to my 800s. And very close clocked w GPS, STM secondary with longer bolt.