Keep tabs on the health and output of your vehicles electrical system safely and accurately. With a patented air core meter movement, this gauge operates with category defining accuracy anywhere from 8-18 volts on negative ground electrical systems. Installation is simple and it can keep you from being stranded on the side of the road.SPECIFICATIONS-Traditional Incandescent Lighting Illuminates Around the Perimeter of the Dial-12 & 16 Volt Compatible, Well-Suited with Nearly Every Street Car or Race Car Electrical System-Gauge Kit Includes Bulb & Socket Assembly, Red & Green Bulb Covers, Mounting Hardware & Detailed Instructions for Installation-Autometer's Race Proven Air-Core Elelctric Instruments Provide Quick & Accurate Readings