Since 2008, all cars sold in the US are required to have a tire pressure monitoring system (TPMS) installed.
Tpms Tire Pressure Monitoring System
The tire pressure gauge is a sensor that reads the tire pressure of all four tires of a vehicle.
Have you ever looked at your tires in the parking lot and wondered if one was lower than the others? Did you brush that thought off, thinking it must be your imagination or the way the car is sitting? You might be right but how do you know for sure? If you're being honest, odds are that you don’t check your own tire pressure.