This may have been answered elsewhere but I can't seem to find the definitive answer. I am considering aftermarket wheels for the P85 and keeping the 19" as my winter wheels/tires. I have been told that the TPMS must be bought at/from Tesla SC at a cost of $125 each. My question is multi fold. 1. Is there something special about the Tesla TPMS that it doesn't use the standard frequencies? 2. If I buy wheels and tires at my local custom shop do I have to pay Tesla more to break them back down and install the sensors? 3. Anyone with aftermarket wheels what did you do?