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1986 944 Turbo Speedometer Calibration

Electrical

Vehicle Information: Model(924/944): 951; Year: 1986; Engine (type, size, modifications): 2.5 t stock; Total Mileage: 96k;

The speedometer reads off, high 7 or 8 mph at 65 mph. I was told there was an adjustment for calibration. I recently acquired a used x band radar unit and have some way to read the correct speed and would like to have the speedo on the turbo somewhat more accurate. The car has the correct size tires on front and rear.

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