1Cammus single-function race car gauges are electronic gauges which have high response and refined designed. It is produced to monitor the data of a car engine. 2This Cammus single?function Voltage Gauge can connect to multi other gauge to add more fun and color to your car, such as intake pressure, oil pressure, speed, exhaust temperature, water temperature, oil temperature, intake air temperature, air?fuel ratio, speed and other racing meters (Which are Not included). 3Cammus's Tinted 17 color gauge series comes standard with features including a black gauge face, magnified tinted lens and illuminated red needle that sweeps 270 degrees for maximum accuracy. 4An analog volt gauge is important because they monitor your car or truck's charging system, which is what provides an electrical current to your vehicle. Ultimately, without a charging system, your vehicles battery would run out quickly. The purpose of a volt gauge, is to monitor the functionality of this system and provide an advance warning in the event there's an issue, so you'll have a chance to address the issue before your battery runs out. This is in contrast to many vehicles which have a built‑in warning which alerts you only after the charging system has stopped working completely. It is extremely important to have a way to monitor your car or truck's voltage system. Spikes can be caused by a variety of different factors including a faulty regulator or related circuits, auxiliary lighting, sound systems, towing heavy equipment, running a snowplow, and more. It's easy to know how to read a truck or car voltmeter gauge as well. Modern vehicles operate on a 12 volt electrical system, and your analog voltmeter will read approximately 12.5 volts when your vehicle is not running, and 14 volts when in use. Essentially, if your car or truck consistently runs below 14 volts, or if it runs steadily above 15 volts, you should have it checked. This is where your 12 volt battery gauge is an extremely practical, effective and easy to use instrument for monitoring your vehicles electrical system. 5Support OBD2 and sensor reading, OBD2 and sensor gauge can be connected, easy installation, just plug and play. 6Touch to change color, touch-sensitive, light color switching easily(a total of 17 colors switching), you can use a remote controller to set up the alarming value and change the backlight color, 3 brightness levels adjustment, you can completely customize the color of this tach gauge and add your own personal touch to the inside of your vehicle. Since a color memory option is built in, you wont have to reset the color of your gauge every time you turn on your vehicle. It will reflect your most recent color setting the next time it is active.