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If it's working when it warms up there is a good chance that you have a bad connection or bad ground.
As Nick suggested, check the connections in the tunnel and also check the connections on the back of the speedometer. If everything looks good then search for the thread on testing your sender.
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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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