On mine, the speedo jumps about and won't read over 60, and the temp guage only works once in a while. I've had the whole thing apart twice, checked all the connections and still had no luck with it. Occasionally the green indicator bulbs on the dash interact with the speedo illumination and the blue one for main beam. Bad earth somewhere ? If it is, fcuked if I can find it.
Another thought. What if it's the drive pinion in the diff. I don't know if Audi 100s have one seeing as they're electronic. Or speed sensor.
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