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How to Replace an Audi G28 Engine Speed Sensor In this video Charles the Humble Mechanic demonstrates how to replace the G28 engine speed sensor. This sensor is located on the outside of the transmission just above the flywheel gear. It sends a signal to the ECU via the grey wire (T55/49), then to the tachometer within the instrument cluster. 1. Engine Speed Sensor The grey wire is located on the edge of transmission, directly above the fl