TPMS

TST tells you to leave it at 158 unless you have specific numbers that you know you want.
I left mine at the 158 number.

My TST TPMS came preset to 158 degrees F, and I left it there. It did alarm for temperature once. I had a brake drum dragging and it saved me from an RV fire. I had Ford replace the brakes on that tire and have had no further alarms.

I figure that driving 65mph on a 100 degree day, the tires get to 110 or so. That means less than 50 degrees more to alarm.

I didn't know mine had an upper temp setting. Maybe I should go look. That would be handy as I look at the temp all the time, hoping a fried bearing would raise the temp.