Autometer Z-Series 2-1/16in 16-36 Volts Electric Voltmeter Gauge - 2651

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