Feature: 1. Black dial with white LED display, features high contrast, easy to read and doesn't dazzle the eyes. 2. The digital scales on the dial are printed clearly, 8‑18V measuring range, convenient to use. 3. 12V universal gauage, suitable for most 12V car, provides precise measurement results. 4. Adopts high quality plastic housing, anti-vibration and anti-wear, having stable performance. 5. Comes with mounting clamp for easy installation, compact and lightweight, can be freely installed. Specification: Item Type: Volts Meter Material: Plastic Lens Color: Smoked LensNeedle Color: RedDial Color: BlackSize: Approx. 52mm/2inLength: Approx.7.2cm/2.8inWire Length: Approx. 52cm/20.5inMeasuring Range: 8-18VPower: DC(10-15V) 12V ProfessionalApplication: Universal for 12V CarInstallation:1.Gauge may be mounted in 2in/52mm dia holes or in car gauge mounted panels .secure gauge with mounting clamps supplied. 2.Drill 3/8in dia .holes and install rubber grommets where pressure or vacuum line passes through sheet mental such as firewall. 3.Attach nylon pressure line to fitting on back of gauge using adaptor, ferrule and compression nut(not included) route line through grommets to engine compartment .connect line to pressure port on engine by using 1/8in adaptor ferrule and compression nut for pressure gauge or 1/8in adaptor and fitting for vacuum gauge. 4.Start engine and thoroughly check installation for leaks. Twist in light socket assembly and connect one wire(yellow) to dash lighting circuit or other 12V power source and the other wire(black) to a good ground.. Package List: 1 x Volt Meter1 x Manual Note: Professional installation is highly recommended.