1. Just check the tires. 2. Read the manual 3. Not sure about every implementation but it still possible to tell by storing wheel rpm associated with engine rpm, gear and steering angle the first few miles after setting it.

There are many cars with tpms in the wheel that still won’t tell you what wheel it is or what’s the pressure, so I still much rather have no sensor to deal with trading the “inconvenience” of checking the tires once the light comes on, which is what you would do anyway.