The industry standard in gauges, AutoMeter’s Mechanical Boost/Vac Gauges are used with more builds than any other. Using a patented, high precision bourdon tube meter movement, there's no other gauge on the market that can provide the levels of accuracy or durability you’ll find with Autometer's. It provides a simple 1/8” NPT pressure connection that needs no electrical hookup for operation. Plus, it includes 1/8” NPT fittings and nylon line kit.