Feature: 1. The 10‑color series vacuum gauge is designed to measure and display the engine compression level of your car or truck. The vacuum reading ranges from ‑1 to 0 bar, 2in(52mm) vacuum gauge. 2. The meter has 10 solid color modes and 2 color cycle modes. Each meter has a built‑in color memory function, so you don't have to worry about changing the color of the meter every time you start the vehicle. 3. A black instrument surface with magnified colored lenses, a black dial, a transparent lens and a luminous red needle, which can be installed on the dashboard, radio slot or driver's side pillar. 4. Even if your vacuum gauge is turned off, it still looks great in your vehicle, goes into a complete blackout and creates a unique and customized appearance. 5. It adopts stepping motor drive mode to accurately display the target, indicate high accuracy, and relatively drive control. LCD display, clear display of exhaust temperature, 10 color backlight switch at will. 6. The parameter display is accurate and stable, with low power consumption. Simple installation, stable performance, anti‑vibration, anti‑shock. 7. Smoke‑colored lenses are used during the day, and LED display is clear and bright at night, includes complete installation kit for easy installation. Specification: Item Type: Vacuum Gauge Material: ABS Indication Range: -1-0 bar Installation Size: 2in or 52mm Background Color: 10 Colors Display Type: Pointer Indication Working Voltage: 12V Function: Designed to measure and display the engine compression level of your car or truck Application: Universal for 12V gasoline vehicles. Package List: 1 x Vacuum Gauge1 x Sensor1 x Power Harness2 x Sensor Wiring Harness1 x Blue Hose1 x 3-Way Adapter1 x Mounting Bracket2 x Screw2 x Nut6 x Tie1 x Manual