I would not read anything into the 158 degree alarm limit on the TST monitor. When I got mine just after they came out, I asked the folks selling them how I could lower that limit and why it was set there. They said the monitor was designed originally for 18 wheelers ( whole different animal) and that the number was just one that was pulled out of the air. I have never seen anything over 105 even on 100 degree days at 55 mph. Interesting enough the temps seem to go down while driving and go back up during stop and go ( where there is no air flow to cool them).
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