Monitor your engine functions with one quick glance and notice any problems before your vehicle leaves you stranded. Don't wait for your factory battery light to come on, once that happens you'll be walking home!  Don't ignore your electrical system, if you have a system, gauges, turbo timers, etc.. you want to keep on eye on your voltage. Don't be left in the dust as Prosport continues to set the trend.  This gauge also incorporates our opening ceremony/Self check each time the vehicle is started. Features: Size: 2-1/16" (52.4mm) Type: Digital Range: 8 - 18 Volts Lighting: Red + Blue switchable backlight What's Included: Mounting Hardware Decals Instructions