Others with more knowledge can confirm/deny this but I believe your speedo and odo are both sent a signal by a quarter sized sensor that plugs into the side of the transmission. The wires run up through the shift coupling tunnel. Possibly the sensor is going bad or the wiring is going intermittent.
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Dave O'Bryan
1977 911 Carrera 3.0 Targa
1987 VW Westfalia w/ 2002 Subaru 2.5 engine at home , 1991 VW Vanagon Hightop camper in Europe, 1987 VW Vanagon Hightop Syncro camper out West, 2014 VW Jetta TDI Sportwagen
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