2 1/16 Inches (52mm) black face gauge, One Year Limited Warranty.
Air/Fuel Ratio Gauge Monitoring car's air/fuel ratio lean-optimal-rich(from 10.0 to 20.0),so you can change air to fuel ratio to maximized power and engine performance, reduced emissions, and higher fuel economy.
Display Feature: An pointer gauge with an illuminated red needle and blue LED display,7 Solid Color Settings for easier night driving.
Easy Installation: Comes with 1.94ft Power Wire and installation instructions,make the install process quick and easy.
Note: They are only accurate at sea level. IF you have any product or installation issue,please contact us, we will offer a good solution within 24hours.