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There is a magnetic reluctance sensor inserted into the transaxle that generates pulses that go to the speedometer ... before you go yanking wires off the back of the speedo, check the sensor at the right side (in the differential housing) of the transaxle, to see if the sensor is bolted secure, and that the electrical connection is secure and clean ... and be sure the back end is up on jack stands, placed under the rear torsion bar tubes, and secure, before you crawl under there!
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Warren Hall
1973 911S Targa
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