Auto Meter 8586 2-1/16" 0-30000 PSI Fuel Rail Pressure Gauge for 2003-2007.5 Dodge Cummins 5.9L GM Duramax LB7 and LLY Factory matched LED through-the-dial lighting provides clear visibility during nighttime use and matches OEM instrumentation Gauge kit includes wiring harness, mounting hardware, and detailed instructions for installation Included wire harness connects to original equipment fuel rail pressure sensor wiring Auto Meters 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