Modern blue LED through-the-dial lighting provides clear visibility during nighttime use. Includes data acquisition grade solid-state MAP Sensor providing unmatched accuracy and durability even in the harshest environments. Autometers Race Proven Digital Stepper Motor Electric Instruments Provide Unmatched Accuracy Which Is Further Increased By Utilizing A Self Calibration Sequence During Power Up. 12 and 16 volt compatible compatible with nearly every street car or race car electrical system. Gauge kit includes MAP Sensor T-Fitting nylon tubing vacuum fittings wiring harness mounting hardware and detailed instructions for installation