GlowShift’s 10 Color Digital Series Volt Gauge is electronically driven and reads your vehicle’s electrical system from 8-18 volts. A volt gauge allows you to closely monitor your vehicle’s battery voltage as well as when the alternator is charging it. The 10 Color Digital Gauge Series features a Low Profile Tinted Lens with a Digital Numerical Readout for quick readings. You’ll also have the choice of a blue, green, red, yellow, white, teal, purple, pink, amber or orange LED display on a black gauge face.