The standard in the industry, AutoMeter's Mechanical Boost/Vac Gauges have found their way into more builds than any other. Using a patented, high precision bourdon tube meter movement, there isn't another gauge on the market that can lay claim to the levels of accuracy or durability you'll find here. A simple 1/8” NPT pressure connection requires no electrical hookup for operation. Includes 1/8” NPT fittings and nylon line kit.Features: Traditional incandescent lighting illuminates around the perimeter of the dial Liquid dampened movement provides smooth pointer movement and extended service life in harsh environment applications. Liquid filled design for superior resistance to shock, vibration, and the elements. AutoMeter’s race proven mechanical instruments provide trusted accuracy while being simple to install No electrical system required for gauge operation - compatible with every street or race vehicle Gauge kit includes 1/8” nylon line, T-Fitting, vacuum fitting, compression fittings, bulb and socket assembly, red and green bulb covers, mounting hardware, and detailed instructions for installation Product Description: 2-5/8" Boost/Vacuum Gauge, 30 In Hg/20 PSI, Liquid Filled, Pro-CompPit Stop USA offers Auto Meter Pro-Comp Liquid-Filled Mechanical Vacuum/Boost Gauge - 2-5/8 in. 5401 at low everyday prices. Be sure to check out all our products from Auto Meter including Auto Meter Pressure Gauges.