Wideband Air/Fuel Ratio Meter
Highly visible, backlit digital display, Allows more precise tuning, Programmable warning alerts rider of too lean or too rich ratio, Displays ratio between 10.0-24.0, Includes Bosch O² sensor, sensor bung, sensor bung cap and gauge bracket, Recommended for use with 4-stroke engines; for 2-stroke applications, use O² adapter PART #1861-0524, Requires a DC 12 V battery; will not function with AC/DC converter