30 after you were driving, or dead cold?
I think they trigger at 27lbs or so.. and won't go off until it gets to some higher number (so it's not going on and off). So if it's cold out, and after you warmed them it was 30, I'm sure you were below the threashold..
Try adding 5 lbs to each with a real gauge of some type and get them even, see if the light goes off.
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