re: Will TPMS warn if all 4 show *
To answer the question someone asked earlier.. will TPMS alert you if all 4 wheels show * in the readings, Yes. After about 50+ miles in a single trip, the tire low icon on the dash will light and it will ding at you once.. As long as you realize this is because you don't have TPMS on those rims (if you have an alternate set), you can ignore it and it won't bug you again.. but the light will stay on until the MO is turned off and back on.
I know this because my TPMS equipped SEAWD was delivered to me without TPMS sensors in the wheels, and my dealer was about 60-80 miles from my house.. on the initial trip home, and on the trip back to get the problem resolved (they ordered and installed and programmed the TPMS sensors), the MO reported a tire pressure warning after about 50 miles.
Not a big deal, but if you're not expecting it, it's a little unnerving that it warns you for no apparent reason..
I'm happy I have the TPMS sensors, but I wouldn't pay list price for a second set if I lived someplace that warranted a second set of rims and snow tires..
Hope this helps someone..
--Kris