The Element management system provides the reliability of a manual management system with functionality of a three sensor digital gauge allowing for easy access to vital air pressure information (front, rear and tank) with LCD display, user defined font and background colors, high/low pressure alerts and voltmeter.Kit Includes:DUAL PNEUMATIC PADDLE VALVE CONTROLLERS (FRONT AND REAR)DUAL NEEDLE 220PSI PRESSURE GAUGE WITH BACKLIT DISPLAYPOWDER COATED SILVER 4 GALLON STEEL TANKCHROME VIAIR 444C60' DOT 1/4" AIR LINE150-175 PSI PRESSURE SWITCHALL NECESSARY FITTINGS, POWER CABLES AND PLUGS