so when i went to get my tires replaced they said that they may have to order a cheap tire monitoring thing that goes on the valve stem for the tire because they aren't reusable. but when they took the tire off of the rim they said that it does not have any type of device in the rim like most GM's did. so if that's the case (keep in mind i went and looked myself) how does the system monitor the tire pressure? I know it works cause it's told me my tires were low before?
http://www.carparts.com/details/GMC/...FQWnnQodcUAAUg
that is what they thought that the tire would use to monitor the tire pressure like most GM's do...but it did not have one in there? this is more for my curiosity of wanting to know how the heck it works.