Temperature measurement is only accurate on inside mounted monitors. Temperature is important to monitor when brakes are too hot or bearing are running to hot and are near failure. I monitor the temp closely and a few degree above my normal range means something is going wrong and it is time to pull over an find out what. I burned a bearing, and saved my axle because of temperature monitoring. I doubt that an outside stem mounted sender would have allowed me save and axle when the bearing gave out.