General description The AEM 30-0300 X-Series Wideband O2 Air Fuel Ratio Gauge Kit is designed to accurately monitor Air/Fuel ratios (AFR) during the tuning process, helping to prevent lean fuel mixtures that could potentially damage the engine. This unit combines a single-channel wideband UEGO controller and gauge display into one compact unit, offering exceptional AFR accuracy and control with an easy-to-read interface. The gauge features a digital LED display and a sweeping LED "needle" that changes colors as the AFR transitions from rich to lean. Technical specifications Gauge housing diameter: 52mm (2-1/16 inch) Operating temperature range: -30℃ to 120℃ Thickness: 2.5 mm Sensor Type: Magnetic Induction Part Number: 30-0300 Material: Plastic + Metal Measurement allowed error: +/- 1-3 cm Other information Package Contents: 1 * O2 Air Fuel Ratio Gauge Kit Note: Installation guide not included; professional installation is strongly recommended. Color may vary slightly due to light