Look for almost all car manufacturers to start using TPS (TIRE PRESSURE SENSORS) in the next few years. I work for a Tier1 OEM wheel manufacturing company, and within the past year, all the companies we supply to (GM, Ford, Honda, Nissan, Dodge, etc.) are phasing in these sensors. Many have started mass production on them so they will be more common as the days pass. On a balancing note, one supplier was not able to balance one of their steel wheels so they had to leave 4 of the holes opposite the sensor not punched to equalize the weight distribution. They do make a huge difference in balancing.