Introducing the new Revel VLS (Visual OLED System) 52mm OLED gauges for accurate and dependable monitoring of vital engine components. Maximum comfort is attained by the use of an OLED (Organic Light Emitting Diode) numerical display. When compared to a traditional LCD display, the OLED display provides sharper contrast resulting in a deeper black for a crisp, clear images that is easier to read at a glance. The technology also allows for undistorted viewing angles approaching 170 degrees. The OLED display also does not require a backlight to be clearly visible at night, which gives the slim profile of the gauge - perfect for mounting in areas where space is an issue. Tanabe utilizes the best in sensor technology with the included LSU 4.9 oxygen content and Lambda value sensor in the 52mm Wideband Air/Fuel Ratio Gauge. While many aftermarket wideband gauges are still operating on the older, inaccurate sensor, OE manufacturers and Tanabe have made the switch to LSU 4.9, the new standard. Compatible with gasoline and E85. All packaging includes the gauge and necessary sensor, mounting bolts, hood, and instruction manual.