Overview AutoCross Yellow 2 1/8" Full sweep Air Fuel Ratio;gauge, with standard matte-black low step bezel and flat glass lens. See available bezel, lens, and pointer upgrades in the appropriate drop-down menus. Fuel Pressure Gauge, Full Sweep 2 1/8" Diameter Features Pushbutton calibration FAST™wideband controller included Calibrated for gasoline applications ONLY. Full sweep provides increased accuracy Easy to read 2 1/8" size Integrated red warning light, illuminates entire gauge red when activated Premium BOSCH wideband air/fuel sensor included Warning light output for additional warning indicator lights Installation hardware, wiring harness, and weld-in bung with plug included Analog .5 - 4.5VDC output for data logging systems Rugged air core movement combined with microprocessor technology for precision and durability LED lighting, choose between Warm White or Cool White