This kit includes four 2 Channel Wide Band Air Fuel Ratio Units for use with an existing Data Acquisition System. Each unit is compact, fully encapsulated and waterproof. These units do not include an LED display or any internal data logging capability. The system is a complete kit including 8 Bosch LSU4.2 Sensors, Weld in Sensor Bungs, Wiring Harness and components, and 4 Two Channel Wide Band Units with eight 0-5 Volt analog AFR outputs that connect directly to QwikData 2 or any other data system with Analog Inputs.