Grams G2-99-0055 Wideband Air/Fuel Ratio Gauge Grams UEGO - wideband air fuel gauge utilizes the Bosch LSU 4.9 sensor which is superior to the LSU 4.2 sensors The Grams wideband air fuel gauges feature a 0-5v output for closed-loop feedback when pairing with a standalone ECU; Grams Wideband measures at 52mm with an LED display that features a 3 color sweep from Red, Yellow to Green The Grams Wideband using the Bosch LSU 4.9 is able to have accuracy down to .001 and utilizes a 4 digit display 52mm Gauge Housing, 0-5v analog output (10-20 AFR), Bosch 4.9 LSU sensor with weld-in bung included Accuracy down to .001 and 4 digit display; Display output from 10:1 to 20:1 AFR; LED Display w/ 3 Color sweep from Red, Yellow, Green