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DS, my new to me 82 SC with 183k miles has a very inaccurate speedo also, grossly understating true roadspeed....doing what must be 80, it reads about 60mph, therefore quite useless. It is the car's original unit and tire sizes are stock, so I figure that a) the signal from the thingy in the transaxle (probably called a transducer?) is either present or not, and if it is, then b) the guage needs to be re-calibrated. So I will send mine off to North Hollywood Speedometer, imagine they'll be able to correct it. Best of luck, John in CT.
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