"My fuel and temperature guage do not show any reading."
Is the fuse (S7; 5 A) good?
If so, then looks at the regulator TCA700Y.
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Perhaps a bad contact with the printed circuit?
Or TCA700Y is defective?
TCA700Y is a positive voltage regulator 10 V; 1,5 A
To buy a new TCA700Y at Audi or a salesman of electronic components.
Good luck!
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