2-1/16in. BOOST/VACUUM; 30 IN HG/45 PSI; C2The 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. Provides Ultimate Style And Visibility Futuristic Red Point Look Precision Movement And Extreme Accuracy 1 Year Limited Warranty Mechanical Movement Provides Accuracy And Durability No Electrical System Required For Gauge Operation Incl. 1/8 in. Nylon Line T-Fitting Vacuum/Compression Fittings Incl. Mounting Hardware/Installation Instructions