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 O? sensor, sensor bung, sensor bung cap and gauge bracket Recommended for use with 4-stroke engines; for 2-stroke applications, use O? adapter PART #1861-0524 Requires a DC 12 V battery; will not function with AC/DC converter. METER AIR/FUEL BA004064