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Where are you located? If you have a multimeter, I would check to make sure you have power and good ground to the speedometer. If that checks out then you can do a quick test by connecting a wire to the speedometer, in place of the wire coming from the sender, and just quickly tap it on and off ground and the speedometer needle should bounce.
If you run out of ideas and you're in the US, I'd be happy to test the speedometer for you.
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1970 911E Sportomatic Albert Blue
1971 911T Sunroof Coupe w/ Twin Plug 2.5 MFI
1973 911E Glacier Blue
1973 911E RSR Tribute Viper Green w/ 3.5 Twin Plug MFI
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