Incredibly High Accuracy In Both Vacuum And Boost, Autometers Digital Boost/Vac Gauge Is Engineered To Provide The Best Possible Accuracy In Applications Ranging From 30 In/Hg 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.