I believe that's the connector for the ambient temp display...
I can recall using it for that on my NG Coupe and I've had a look behind the clocks on my 80 and it's there even on that car.
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Still have my RS2 tuck up safe, also a 1992 C4 2.8 Avant quattro and a B3 quattro Saloon G60 conversion in progress.
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