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1985 911 Carrera Speedometer Calibration

Electrical and Electronic

Vehicle Information: Model: 911 Carrera ; Year: 1985; Body Type: Targa; Engine (type, size, modifications): 3.2; Total Mileage: 89000;

I recently acquired this car and have noticed that the speedometer readsfast. When it says the car is going 90 mph (straight up), it's onlygoing 82 mph. The tires that are in the rear are 225/50 x 16. Would itbe easier to buy higher profile tires to correct this mis-calibration, orre-calibrate the speedometer? I need new tires anyway, but don't want togo to 225/65 x 16 if I don't have to. What does the re-calibrationentail?

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