Running on deflated or overinflated tires is not wise. Most new cars already have a tire pressure monitoring system built-in. The Bartun Bluetooth Tire Pressure Monitor can also help. It displays the pressure and temperature of your tires to take the guesswork out of the process.
The Bartun TPMS can be set up in a few minutes. It is compatible with iOS and Android devices. The sensors are waterproof. You can find out more about them here.