Mounting Hardware/Installation Instructions Next generation instruments from Auto Meter combine our NASCAR proven racing movements with our award winning LED lighting technology to offer you the ultimate in Accuracy, Durability, Visibility and Styling. 2-1/16 BOOST/VACUUM, 30 IN HG/30 PSI, MECHANICAL, SPORT 2 1/16 Inch Mechanical Boost Gauge Auto Meter 8304 Boost Gauge - Pit Stop USA AutoMeter Factory Match Gauges AutoMeter 8304 - Autometer Factory Match GM 2-1/16in 35 PSI Mechanical Boost Gauge. Mechanical boost gauges have become the staple in boost pressure monitoring for all types of engines, gasoline, diesel, or otherwise. Ultra-precise bourdon tube meter movement ensures accuracy and durability not seen anywhere else in the industry. A simple 1/8 NPT Compression Fitting Incl., 1/4 in., NPT Adapter Incl. AUTOMETER Boost Gauge - GM Factory Match - 0-35 psi - Mechanical - Analog - 2-1/16 in Diameter - Black Face - Each ; Black Dial Face; Orange Pointer; White LED Lighting; Mechanical; 0-35 PSI; FEATURES: Factory Matched LED Through-The-Dial Lighting Mechanical Movement Provides Accuracy And Durability No Electrical System Required Incl., 1/8 in., Nylon Line; 1/8 in.