A Voltmeter Gauge can prove to be an extremely beneficial device in the long-term maintenance of your vehicle. While Voltmeters measure electrical potential difference between two points in an electric circuit, GlowShift’s 2 1/16” Volt Gauge monitors your vehicle’s electrical system from 8 to 18 volts to ensure that all facets are operating efficiently. This includes the monitoring of vital engine systems such as the power levels of your battery and alternator. GlowShift offers a variety of 52mm Voltmeter Gauges, so you can upgrade and customize the look of your vehicle’s factory standard volt gauge. GlowShift also includes mounting hardware, installation instructions, free lifetime technical support and a one-year limited warranty with each purchase.