This is the same gauge used in VIAIR's onboard air hookup kits. Utilising a well-designed, high quality 150 PSI pressure monitor with built-in ON/OFF switch to activate or deactivate compressors as needed, this gauge kit is perfect for those who already have an onboard air setup. Included Parts: (1) Illuminated Dash Panel Gauge (1) 20 Ft. Lead Wire with Inline Fuse (30 & 40 amp included) (1) 1/8in (F) NPT Compression Fitting (3) Insulated Female Terminal Connectors (2) Insulated Male Terminal Connectors (2) Quick Splice Connectors (3) Ring Terminals (6) Cable Ties (3) Cable Tie Brackets (1) Continuous Grommet (2) Mounting Screws, Washers, Nuts (1) Instruction Manual