With all the really smart people on this site, someone must know the answer to this.... a co-worker bought a new Toyota Matrix (on my recommendation.) I have a 2006 and have a second set of wheels with Bridgestone Blizzaks for the Northern Wisconsin winters. The car is an awsome snow and ice driver with these tires. My friends new Toyota has all season radials and is almost undriveable on snow and ice. He attempted to order a set of wheels and snow tires but was told he would have to order wheels with internal pressure senders and then have them calibrated to the cars ECU. Needless to say this is very pricey and inconvenient. What happens if one mounts an older set of wheels (assuming they fit) with no senders? Does one just get an alarm message from the ECU? If so can it be disabled with a scan tool? Anyone have any suggestions?