Late to the party, sorry
I buy my sensors from Tirerack, good prices and OE stuff. Be sure to buy the sensor
and the "install kit". Damon Witters (
O: 888 428 8355 ext. 643) over there knows our cars and is a good guy.
I
always use my TPMS dash display on track for awareness of how much pressures are going up during a session. I see 34+ psi and know I may as well come in and bleed air. While folks will say TPMS is useless for track I would take the other side and say I find it invaluable. For me it always works perfectly.
Obviously you want to double check and start your day with a gauge, preferably graduated on .1 (tenths) of a PSI increments but the TPMS is perfect for all but racer$.