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1986 928 Speedometer & Cruise Control Problem

Electrical

Vehicle Information: Year: 1986; Engine (size, modifications): 5.0L; Total Mileage: 140,000; Transmission type: Autotomatic;

Occasionally my speedometer fails to register anything until I exceed 60 KM/H (40 MPH), then it jumps up to the current road speed. It seems to do this more when the car is cold. It is as if the needle is stuck and then frees itself. My owners manual states that the cruise control is automatically available for use after reaching 50 KM/H, but when I try to set the cruise nothing happens. I have tried setting it at various speeds above 50 KM/H with no success. Is there anything simple I can look for to cure this problem?

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