Tire pressure monitor

TruckwithsensorsThe Velcro-mount PressurePro tire pressure monitors contains small sensors that watch tire pressure and warn of tire deflation ahead of time.  The sensors replace the valve stem caps and are easy to install. The product attaches to a dashboard and plugs into a cigarette lighter receptacle, but is also capable of being hardwired.

L&S Safety Solutions, tirepressuremonitor.com