KOSO NORTH AMERICA Wideband Air/Fuel Ratio Meter 3.9″ W x 1.7″ H x 0.90″ D BA004068

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, Measures 99.5mm (3.9″) W x 42mm (1.7″) H x 22.5mm (.9″) D, 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