Features： 1、Easily display at night:Our gauge is highly visible with a blue digital LED,easy viewing at all angles during any lighting conditions. 2、The volt gauge meter includes electric wire with necessary mounting and installation hardware,no need any sensor. 3、Regarding the pressure value reading of the engine's vacuum tube, it displays 20 LEDs, compatible with all 12V cars. 4、The vacuum voltmeter has the characteristics of low power consumption, long life and high accuracy. 5、This digital gauge is black with a bright blue LCD reading, intuitive color display, convenient and fast. Specification： Item Type: Car Voltmeter with LED Digital Display Diameter: Approx. 52mm / 2in Size: Approx. 43mm / 1.7in 58mm / 2.3in Colour: Black Material: ABS Reading: Blue digital LED Power Supply: 12V / Maximun 0.3A Viewing Angle: ≤180° With red, green and yellow LEDs. Accurate electronic reading, 20 LED display. Compatible with all 12V cars. How To Use: 1. Connect the power cord to the meter. 2. The sensor with wire is inserted into the engine vacuum tube and connected with the wire of the corresponding color of the power cord. 3. Black represents the negative pole, which can be used after connecting the negative pole of the vehicle. Package List： 1 x Car Voltmeter 1 x Wire Harness 1 x Wire Sensor 1 x Connecting Pipe 1 x Adapter 1 x Connector 1 x User Manual