Tire pressure monitors have been mandatory in all passenger vehicles since September 2007. But not all our cars have been made in the last decade. Add the same safety assurance to your classic ride with the Zus Smart Tire Monitor. The system consists of four custom valve caps, as well as a box that relays pressure and temperature readings from the caps to the companion app. You'll get notifications if it senses a leak or if you're a little low on air, as well as peace of mind that you're driving on properly inflated tires.