I just got my Speedo back on the same car. The speed shown was slightly erratic and it wasn´t counting the miles. Its fine now but for what its worth my mechanic said the Tacho are like a good watch and the people who rejuvinate them need to know their stuff. Get down to Porsche and they should be able to pop a functioning replacement in quickly to see if it works. That way you can establish if the actual speedo is the problem or not. It only takes a second and should cost nothing. Mine had worn cogs that needed replacing.
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