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1982 928 Speedometer problem

Electrical

Vehicle Information: Year: 1982 928; Engine (size, modifications): v8 not-S; Total Mileage: 77000; Transmission type: Manual;

My original 80 mph speedometer manfunctioned at about 72000 mi.. The needle would skip, stick, and jump around. I then had it changed to the 160mph speedometer which helped for a while, then happened again. I then had the sending unit at the transmission changed, which, again, helped for a while, then it occured again. Could there be another reason for the speedometer jumping around. The needle would drop and jump, however when the car is accelerating the needle would go back up and stay until I get off the accelerator, the needle then drops again.

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