If the speedo is still working then the sender is too, I had a speedo to pieces a few weeks ago and it's a self contained unit with the milometer driven from a stepper motor. I'd suspect a soldered joint has become dry inside the speedo unit, if you have a soldering iron then you can run it over any suspect joints, if you want to replace just the speedo unit then beware as Audi have different versions of the binnacle and the innards aren't interchangable.
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