Had a similar issue ( well kind of ) problem with my 90 quattro 20v sport where by the speedo would just stop working then go mad all round the dial. Turned out it was the heat sink attached to the fire wall. Changed that and it was fine.....then the computer 'quartz' blew so I obtained a new dash.
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1987 Audi Coupe quattro - Clarion Tribute Car
2012 Audi A6 Allroad
2004 Mercedes SLK 350
2017 Mercedes GLA 220
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