I had this problem twice on the 940SE wagon and once on the 940SE sedan. In ecah case it was very cold and only lasted for one day. It has been four months since have had the problem. It might be the circuit board, but I'm not ready to take the instrument panel out just yet.
I also had this problem on my 92 960 and took it to a shop to fix. The mechanic took it out and couldn't find anything wrong and advised against buying another unit. Put it back in and never had another problem with the speedometer.
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