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Re: Classic Instruments Speedometer
Long shot, but it's got to be something that's changing or variable, could it be the spacing between the pickup and the magnet if you're using a driveshaft sensor?
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1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
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