This plug and play harness kit is required for IE TrueFlex ECU Tunes for VW and Audi MQB Gen 3 engines. This includes everything necessary for the flex-fuel sensor to send real-time data from your fuel system to the ECU and adjust for any content mix from 91 pump to full E85 automatically.Features: Required for IE TrueFlex MQB tunes Allows for instant adjustments from 91 pump to full E85 Harness for VW MK7 & Audi 8V EA888.3 engines Sends sensor data in real-time to IE ECU calibrations Includes everything needed to install Kit Includes: (1x) IE TrueFlex Wiring Harness (1x) 2 amp Fuse (1x) Ethanol Sensor (2x) Ethanol Sensor Quick Connect Couplers (2x) Hose Clamps Installation:This harness kit is fully assembled to proper lengths and includes everything needed to install in a clean and factory-like install. Disconnecting and cutting of factory soft fuel lines is required and should be completed with great care or by a professional. Click here to download the install guideVehicle Fitment: Audi A3 8V Audi S3 8V Volkwagen Golf GTI Mk7-Mk7.5 Volkwagen Golf R Mk7-Mk7.5