1Cammus single‑function race car gauges are electronic gauges which have high response and refined workmanship. It is produced to monitor the data of a car engine. 2Cammus single?function race car gauges can display one driving parameter on one gauge. 3Cammus also has other racing instruments that provide turbine pressure, intake pressure, oil pressure, battery voltage, speed, exhaust temperature, water temperature, oil temperature, intake air temperature, speed, etc.(This air fuel ratio gauge does not include the above functions)and this gauge can be connected to other racing meters in series to add more fun and color to your car. 4Cammus'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. 5Touch 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. 6Support OBD2 and sensor reading, OBD2 and sensor gauge can be connected. Easy to install, plug and play. 73 brightness levels adjustment, you can customize the color of this gauge and add your own touch to the inside of your vehicle. 8A color memory option is built in, you won't have to reset the color of your gauge every time you turn on your vehicle. It will reflect your most recent color setting the second time it is active.