So I mounted a wheel/tire set I used on my old 987.1 on to my new 981. Took the car out to get the TPMS to synch with the car, but no luck. I had hoped they would work because a) I just recently installed these sensors, and b) I bought them from tire rack, and tire rack lists the same sensor they sold me for the 987.1 for the 981 (HUF 433 MHZ). Any suggestions? Thanks!