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Speedometer Reading

Cables and Controls

Vehicle Information: Model: 911 Carrera Cabriolet; Year: 1987; Body Type: Convertible; Engine (type, size, modifications): 3.0l; Total Mileage: 48000;

My speedometer seems to be reading high. The car is totally stock with orginal tire size and wheels. At 80mph the tachometer is reading 3300rpm in 5th gear. Is this right? Is there anywhere I can look to get mph mappings to tachometer rpms?

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