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How to Replace an Audi G28 Engine Speed Sensor In this video, Charles the Humble Mechanic shows how to replace the G28 engine speed sensor. This sensor is located on the edge of the transmission, above the flywheel ring gear. It transmits a signal to the ECU via a grey wire T55/49, then to the tachometer on 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 a