Description The volt gauge measures the voltage of automobile power and points out the numbers with high sensitivity and accuracy. Beautiful orange LED lighton the dial is designed for easy reading in the darkness. Numbers and pointer clearly show the voltage. Features - Condition: and high quality.- Used to measure the voltage of automobile power.- Numbers and pointer clearly show the voltage.- Orange light on the dial for easy reading in the darkness.- Measurement range is 8~16V.- High sensitivity and easy operation.- Professional installation is Highly Recommended. Specifications - Color: Black.- Material: ABS Plastic.- Unit: Volt.- Measurement range: 8~16V.- Power: 12V DC, Max. 0.3A.- Volt meter size: 5.7 * 6cm / 2.2 * 2.4in (max. diameter * height).- Volt meter weight: 71g / 2.5oz.- The voltmeter gauge indicates electical pressure or voltage, It provides easy to understand information on the condition and operation of your vehicle's electrical system.- Under normal conditions the volmeter will indicate between 13 to 15 bolts while the car is being operated at usual road speeds. If the gauge reads higher than 15 volts, it indicates that the charging system's voltage regulator is not operating properly and it can result in damage to the battery and accessories. A continuous reading of less than 13 volts indicates that the charging system is not operating properly and will eventually result in a discharging battery.- If the voltmeter reads too high or too low at normal operating conditions, the battery, the starting system,and the charging system should be throughly tested and serviced as necessary. Assembly Procedure 1. A2-1/16" hole is required for indash mounting.2. Use 18-guage wire to connect ground,sender and ignition wires as shown on circuit diagram above, Caution: disconnect battery ground cable to avoid accidental grounding of electrical system while making electrical connections to the guage.The sending unit is usually installed in the same hole from which the warning light sender in removed.Packing list: 1 * Voltage Gauge1 * Bolt Pack1 * Instruction