Mechanical Movements Provide Accuracy And Durability Even In The Harshest Environments,No Electrical System Required For Gauge Operation; Compatible w/ very Street Or Race Vehicle,Autometers Race Proven Mechanical Instruments Provide Trusted Accuracy While Being Simple To Install,Gauge Kit Includes 1/8 in. Nylon Line; T-Fitting; Vacuum Fitting; Compression Fittings,Unique Three Dimensional Dial Design Gives Added Depth And Style To Your Custom Dash,Includes Mounting Hardware; Detailed Instructions For Installation