I have had them for a month or more and when I add air the sensors read very close to my gauge (no more than 1 lb +/-). I have the Harley Davidson gauge I bought for my old Fatboy so it is probably perfect right? The change in temp and pressure change as you ride really surprised me also.

Have you figured out how to get the Fobo app to start after you restart your phone? I have to turn my phone off and put it in a locker before going into work everyday. Some times I forget to restart the Fobo app. If it is not started I do not get warnings that the tires are low while I sleep at night or walk up to the bike before a ride.

One thing I learned is that if you do not have a compressor in your garage and you have to ride to a compressor to put air in your tires the readings will be way off.
Steve