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. Feature Points Traditional incandescent lighting illuminates around the perimeter of the dial 12 and 16 volt compatible, well-suited with nearly every street car or race car electrical system Gauge kit includes bulb and socket assembly, red and green bulb covers, mounting hardware, and detailed instructions for installation AutoMeter&rsquos race proven air-core electric instruments provide quick and accurate readings