I have one of the new 2008 GMC Sierra's and I am having trouble resetting my tire pressure monitoring system. I had a new tire installed with a new detector in it and it wouldn't register with my truck. I followed the instruction manual on how to reset the system and that didn't work? The GMC dealers here aren't any help because the system is new this year and they don't know how to work it either. Anyone else out there have any experience?