Incredibly high accuracy in both vacuum and boost, AutoMeter?s 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.