Hello Peter,
I don't have a useful reply to your post, just a reflection. My 1992 960 had been sitting for over a year when I bought it and the speedometer did not work for at least the first fifty to a hundred kilometres of driving.
Then it began to jump up and then back to zero for a while. And then it just began to fully work. I don't have any explanation for this but it would appear the Volvo gods woke up with all the stimulation and everything got back in order. Now it is steady and reliable.
But I know that if I leave it sit for a while the gods will be displeased once more.
Bob
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