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Dremd-
The fuel consumption signal I used on my TDI goes from the ECM directly to the instrument cluster. Mine is a '96 so it's probably quite a bit different from yours, but FWIW, my fuel consumption signal enters the 28-pin connector on the cluster on pin 26. In the Bentley manual, the description is "Single Connector, multi-function indicator signal."
That said, the VSS signal also goes to the instrument cluster and in my case was found on pin 27 on the cluster connector. Removing the instrument cluster to gain access to these two wires may be a minor hassle, but may be your most convenient access point. Good luck!
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