Make sure you pull the sensor out before pulling the motor. Install new ring gear and when its back together install new sensor. I use a bussiness card to set gap between ringgear teeth and the sensor. Erase fault codes before starting engine.Sensor is held down with a bracket. Unscrew nut and pull out sensor The 2 nuts that are on the bottom side are your adjustment nut to set the gap. I leave them alone because when you put new sensor back in , the way the nuts aradjusted may be same setting for new sensor. Sensor may be tight getting old one out. Its plastic. if it breaks coming out, no big deal. you need to replace it any way. Also, replace the starter with a linde starter. Reman starters will eat up your ring gear. Had this happen on 2 different units. Reman starters cause problemns on Linde.