Autometer 2-1/16 inch Electric Voltmeter 18V Antique Beige Gauge - 1891

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.
Installation Instructions