The used wheels and tires that I recently purchased do not have TPMS. Where is the best place to puchase a set of 4 TPMS? Should I buy them used or new? Will other GM vehicle (Yukon, etc) sensors work on the G8GT? I will need to have the tires re-mounted and re-balanced in order to have them installed. So, I want to get them soon to get the ball (and tires) rolling! Or, can I run the tires without the sensors and turn off TPMS on the vehicle computer to avoid the alarms?