Features: 1.Electronic gauge with high response and accuracy, has the opening sweep movement, can easily get results. 2.Bright blue LED illumination, allows easy reading during both day and night, convenient to use. 3.4pcs red+4pcs yellow+2pcs green indicator, can clearly shows whether the air?fuel ratio is normal. 4.Designed with a racing look, can enhance your car interior with a sense of sporty and cool. 5.Universal led air/fuel meter, lightweight yet durable, simple operation and easy installation. Specification: Item Type: Air Fuel Ratio Gauge_x000D_ Material: Plastic_x000D_ Power:Professional 12V, IGN Maximum 0.3A_x000D_ Input Voltage: 0-1V_x000D_ _x000D_ Display Range: 20.0%-10.0%_x000D_ _x000D_ Digital Accurately: Every 0.5%_x000D_ _x000D_ Diameter: Approx. 52mm/(2 1/16in)_x000D_ Accurately of Analog LED Type: Every 0.5%,using BAR type to light up_x000D_ Direct Analog: 19.5-18%, 17.5-13%, 12.5-10%_x000D_ LED: Total 10Pcs, Red x 4Pcs, Yellow x 4Pcs, Green x 2Pcs_x000D_ Fitment: _x000D_ Fit for 12V Car models with narrowband O2 sensor_x000D_ Fit for 2in/52mm diameter gauge pods holder_x000D_ _x000D_ _x000D_ Wiring:_x000D_ Red-Positive_x000D_ Black-Negative_x000D_ Green-Signal Note: Easy to install with installation instruction.