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.