High Precision Racing look enhance the characteristic to your car/vehicle Function: Numbers clearly show, LED backlit for easy reading in the darkness. Versatile design: In addition to measuring and displaying the air/fuel ratio, the Air/Fuel Ratio Gauge also features a broadband measurement and digital display. This means you have access to more comprehensive data and into your engine's combustion state for precise tuning and optimization Fitment:Universal 52mm diameter Voltmeter fit for Motorcycle Car /Truck/ Gasoline Engine (The compatibility just for reference .Please make sure the item fit for your car before purchase.) Fitment: Fit most of 12Volt gasoline vehicle, Fit 2inch or 52mm Diameter Gauge Pods holder Voltage:DC 12V Diameter:52mm/2Inch Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Type:Automotive 12V Generation 1 Universal Air-Fuel Ratio Meter Kit Colour:As Shown Material:Plastic Package Contents: 1 x Air Fuel Ratio Measurement Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.