Modern red LED through-the-dial lighting provides clear visibility during nighttime use. Includes data acquisition grade solid-state pressure transducer providing unmatched accuracy and durability even in the harshest environments. Autometers Race Proven Digital Stepper Motor Electric Instruments Provide Unmatched Accuracy While Keeping Hazardous Fluids Outside Of The Vehicle. The accuracy of digital stepper motor gauges is further increased by utilizing a self calibration sequence during power up. Gauge kit includes 1/8" NPT stainless steel pressure transducer 1/4" NPT adapter 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