Does anyone know SPECIFICALLY how the tire pressure monitor works?

Gary in Sandy Eggo

Not sure about the later models or the GTP's, but on my 97 GT, it utilizes the ABS sensors; when a tire's pressure drops, it's circumference changes also, the system looks for a variation in wheel speed and determines that one of the tires must be low on air--if all the tires are low, it'll never let you know it because they are still spinning the same speed.

That's why it can take 10-20 miles to determine if a tire is low

Stupid question but where does it indicate that your tire pressure is low ? and do all the gp models have this feature ?

do 98's have a sensor. I have been trying to find the button besides the steering column but nothing. does the computer get messed up if youdont reset it and change tires