I have Tire Guard TPMS on my 2005 GL1800. I have had this unit for several years using it on 2 Harleys and my GL1500 and 2001 Goldwing. But even with new batteries I have found that the rear sensor is really slow in transmitting changes in pressure. My front unit will show increases from a cold tire to a warming up tire in just a mile or so. But the rear won't show a change for sometimes 30 miles. I am thinking of replacing the system and am wondering what may be the best that others are using.