Firstly what shape is the 80 quattro? i'm guessing at type85, in which case it will most likely be electrical speedo sender. This is on the side of the gearbox diff casing (from memory its just above the passenger side driveshaft output flange.)
IT could also be a problem within the instrument cluster where speedo sender is giving a reading from diff worm drive, but the tripmeter isnt picking up the signal for distance..
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1986 UR Quattro - (1982) Lombard RAC Group 4 recreation - #24 H.Demuth/J.Daniels
1981 VW mk1 golf GTi - now 5cylinder and RWD.
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