The RF circuit boards that should be able to read/write TPMS data have arrived. Photo shows the two devices on a graphic novel for size comparison. The smaller is for transmit and the larger for receive. They are really tiny. I also bought new Subaru compatible TPMS sensors since the OEM ones are over 12 years old. These new sensors supposedly simultaneously output multiple manufacturer formats, which should be a plus for decoding. Also, if they output both Subaru and other formats (such as Ford), I should be able to buy an off the shelf display unit that will display detail data for each individual tire. Still want to try decoding directly using an Arduino if I can.