The FT700 C & D Unterminated Harness is an optional wiring solution designed for FuelTech's FT700 and FT700PLUS. While the C & D Harness is not required to use the FT700 or FT700PLUS, it is highly recommended as it will allow you to fully leverage the full engine management capabilities of the FT700 or FT700PLUS. The C & D harness is essential to use the ECU’s two internal wideband O2 sensor controllers as well as substantially increasing the available inputs and outputs . It provides a flexible and customizable wiring option, perfect for those seeking to fully leverage the advanced capabilities of the FT700 in high-performance applications.