Since Costco sold me a set of BFG MT 315x75x16 for $180 per tire but then said they would not mount them I returned them and bought a set at Discount tire for even less. When I showed the manager the bill from costco and asked if he could beat their price he said yes and then said "Costco wouldn't mount them would they?"
He said that on my second set of Hummer wheels with sensors that they had a machine/computer that could recalibrate the H3 computer. I thought I could do this but it sounds like you need some external equipment to do it.
What surprisd me was that the Tire Rack sells these tires for $224 and I got them for about $185 each. Should have them on this coming Monday.

 

the guy was blowing smoke up your ****!! I think on GM cars like the Vette the sensors need to be recalibrated by an external computer but not the H3. H3's system is nothing more than following the steps in your manual, should take 5-10 minutes tops and it's done. Same thing is you put your spare on, you'll need to follow the steps in the manual to calibrate that also.