I've purchased a new full-size wheel to use as a spare and am gathering the rest of the assembly (metal stem, pressure sensor, tire, jack, wrench, emblem, tote, etc.). My question is: will the spare be 'read' by the TPMS? I don't know exactly how it all works. Is the sensor a proximity switch or a radio transmitter or what? If it functions as a prox switch it won't affect anything but if it sends or reflects some type of signal to a nearby transceiver I think it might.