Brett,
I have a winter set of rims for my snow tires and the rims do not have sensors. I have my summer rims & tires stacked right next to my Trac and if parked overnight I can drive about 15 miles before the warning "Beep" and dash indicator comes on. After hitting the reset all that is left is at first a blinking then steady warning dash light. I do have the optional messaging option so mine might work a bit differently from on that doesn't have that option. If I don't park next to the summer tire stack I get the warning at startup. If I had to do it again I would buy an extra set of sensors!
:haveabeer: