AudiWorld is your friend. This Forum is generally more social then technical.
You have a dying cluster most likely. Audi has lost a class action suit, but that doesn't mean they'll replace yours. Only fix is to go see a dealer or a GOOD indie, and have the ckuster checked for symptoms.
Generally, flickering needles and way-off-scale readings are cluster failre. In some rare cases, if only the temperature needle is jumping, then you might need only a temperature sender.
http://forums.audiworld.com/tt
Go there and STFA for cluster: LOTS of threads and help.
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