X-Series AFR Gauge, a wideband UEGO sensor controller accurately monitors Air/Fuel ratios (AFR) during the tuning process to prevent a lean fuel mixture, which could lead to engine damage. It combines a single-channel wideband UEGO controller and gauge display into one unit, offering high AFR accuracy and control with an easy-to-read interface. The gauge-type wideband UEGO controller features a digital LED display and a sweeping LED "needle" that changes colors as AFR shifts from rich to lean. The unit's 52mm (2-1/16 inch) gauge housing fits in most gauge pods and can be remotely mounted in various locations. High temperature resistance (-30°C to 120°C), super toughness, and 2.5mm ultra-thin design. Part Number: 30-0300. Note: Installation guide not included; professional installation is recommended. Please verify compatibility before use. Product design may vary slightly between batches, including minor color or appearance differences, which do not affect functionality. Color: As shown. Material: Plastic. Package contents: 1 x O2 Air Fuel Ratio Gauge Kit. No other items included. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement tolerance: +/- 1-3 cm.