Saturday I switched to my snow tires, which don't have sensors. The orange light didn't come on until I hit precisely 50.0 miles on my first drive with the snows. It blinked for about 30 seconds, and then stayed on solid.

Now, when I start the car, the light blinks for 30 seconds and then stays on.

I thought the warning light being always on would drive me nuts, but it doesn't. It's tucked way down in the right hand corner of the display board and doesn't catch my eye. In fact it's kind of decorative and fitting for the season ;-).

Now I definitely wouldn't bother installing new sensors on my winter tires, though that had been my plan. The winter tires will be on the car for just three months anyway. And I sure don't require a warning to tell me I'm low on air - somehow I've survived 40 years of driving without that.