Incredibly High Accuracy In Both Vacuum And Boost, Autometers Digital BoostVac Gauge Is Engineered To Provide The Best Possible Accuracy In Applications Ranging From 30 InHg To 30 Psi. Our Patented Gauge Technology Allows The Gauge To Calibrate On Every Startup To Compensate For Altitude, Barometric Pressure And Other Atmospheric Conditions, Assuring You Of The Most Precise Reading Possible. A Direct Plug In Wiring Harness Is Included For Ease Of Installation. A High Pressure Digital Boost Only Gauge Is Also Available For Diesel Or High Boost Gasoline Applications.