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How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician shows how to replace the G28 Engine Speed Sensor. This sensor is situated on the outside of the transmission, above the flywheel gear. It transmits a signal the ECU via the grey wire (T55/49) which is then sent to the tachometer within the instrument cluster. 1. Engine Speed Sensor It is located on the outside of the transmission, above the flywheel ring gear the G28 Engine Speed Sensor sends signals