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Although I don't expect it, double-check there are no OBD codes at the diagnostic connector, even if the Check Engine light isn't illuminated. The procedure is in the FAQ. On connector A, port 2 (fuel system) you're looking for code 3-1-1 (Speedometer signal missing). If not then the problem can be assumed to be at or in the instrument cluster and there should be no need to test for a signal from the sender.
There are two sections in the FAQ that address speedometer failures such as yours: in the Electrical:Instruments section and in a feature article on Speedometer repair in the Descriptive file section, also an instrument cluster repair article there. The fault will often be a poorly seated or oxidized connector or a damaged flex circuit board. Have you had the cluster out recently or done work under the dash? There is a known issue with a bad (shorted) capacitor in the Yasaki instrument clusters that can cause speedometer and odometer failure. It's listed for the 1990-1992 700/900 series, so it doesn't appear to affect your 1993 cluster, but you should still be aware of it.
The procedure for getting at and removing the instrument cluster in 940s is in the FAQ. Examine closely the pic of the side clips that you need to bend inward. If you have trouble removing the black metal bezel to get at and remove the cluster then post back for additional tips. There should be no need to do it from underneath the dash. Be extra careful not to scratch the bezel. The bezel and the side clips are very sturdy.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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