GlowShift 10 Color Digital Series Quad Air Pressure Gauges are electronically driven and read (4) sections of your vehicle’s air ride suspension system, air tanks, air bags or air horns independently. This electronically driven quad digital air pressure gauge displays levels from 0 to 200 PSI, identifying if aftermarket systems are getting an adequate amount of pressure. Each quad digital air suspension gauge includes (4) 1/8-27 NPT Electronic Air Pressure Sensors, (4) 1/4-18 NPT Manifold Adapters, Wiring Harnesses and more for installation.