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1976 911S Speedometer

Electrical

Vehicle Information: Model: 911S; Year: 1976; Body Type: Targa; Total Mileage: 124,000;

My speedometer is not working properly and I need to diagnose the problemin order to replace the correct part. Basically, my speedometer works,and is accurate, until I reach about forty-five mph, then it reads thirtymph at any speeds higher than forty-five. From this discription can youtell what is wrong?

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