The Edelbrock #91170 is a 2-Channel Wide Band Air Fuel Ratio Monitor Kit. This kit features a compact, fully encapsulated waterproof Amplifier unit specifically for use with Data Acquisition or Engine Management Systems. These units do not include an LED display or any internal data logging capability. The system includes two Bosch LSU4.2 Sensors, Sensor extension harnesses, sensor weld bungs, and a wiring harness with a 0-5V analog AFR output that connects directly to a QwikData 2, ProFlo2, ProFlo 2/XT, or other system with Analog Inputs.