Auto Meter 6559 Ultra-Lite Digital 2-1/16" 30 In Hg.-Vac./30 PSI Digital Vacuum/Boost Gauge Features Auto Meter's E-Z View Digital LED Display System which maximizes readability and minimizes distracting high speed digit changes Includes data acquisition grade solid-state MAP Sensor, providing unmatched accuracy and durability even in the harshest environments Auto Meters race proven digital stepper motor electric instruments provide unmatched accuracy which is further increased by utilizing a self calibration sequence during power up Gauge kit includes MAP Sensor, T-Fitting, nylon tubing, vacuum fittings, wiring harness, mounting hardware, and detailed instructions for installation 12 and 16 volt compatible, compatible with nearly every street car or race car electrical system