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Dear Stan,
Good p.m. and may this find you well. In the 1993 940 (sorry, I don'thave a 1992 wiring diagram) the wires from the speedometer pick-up inthe differential pass through connector C-1, which is at the bottom of the "A" pillar (the one at the windshield). There is also a ground wire, which is affixed to the body, near the driver's door lower hinge.
You should also check the screws, that hold the speedometer to the cluster. If those are loose and/or corroded, it can make for an intermittent connection.
If, after inspecting connector C-1 and the speedometer cluster screws, you find nothing wrong, it would appear that the speedo has failed internally. This happened to me. At first, the cruise control would only engage at 70+ miles/hour. Then the speedo went erratic. Finally, it didn't work at all.
I got a replacement from a salvage yard, send it to APT Instruments in Bloomington, MN (USA). For $60 (includes two-way shipping), they set it to the mileage that was on the car before the speedo broke, plus the distance traveled, after the speedo broke. You'll need to file with them an affidavit, and provide some documentation as to the actual mileage (e.g., a repair bill, that has the mileage noted).
Hope this helps.
Yours faithfully,
jesecon
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