Autometer ES 52.4mm 30 In. HG/20 PSI Vacuum/Boost GaugeThe 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. Modern red LED