I'll interject some more confusion:
My Avalanche (and my Cadillac) tell me which tire is low through the Driver Information Center (DIC). Each wheel has a sensor, and when you move wheels around you need to reprogram the system to tell it which position the wheel is in. Our BMW only tells you that a tire is low, not which one, and uses the wheel speed sensors to identify changes in the diameter of the tire as the result of low (or changed) pressure. Our Wrangler gives a low pressure warning that is based on actual pressure using wheel sensors, but it doesn't tell you which one is low.
Since the TT system uses external monitors, I doubt it would interfere with whatever system your Ford is using - whether it's using wheel speed or RF on the wheels. I've never used one, but if you think about it - the TT system has to be able to operate in a manner that will not interfere with other monitoring systems (or other radio systems in general). I think they'll be fine installed on the TV.