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If its the same as the 1990 740 GL: Often caused by failure of tiny plastic gear (underdesigned) in odometer that blocks odometer motor, which is powered by the same circuit board as the speedometer, thus interfering with it. Also the speedo lift-out plugs (5 tiny underdesigned plug pins) can have intermittent contact (test by flicking clock adjust rod). Remedy: 1. Remove damaged planet gear (and replace if possible; if not, at least you have a speedo so you don't get booked for speeding). 2. Solder wires to circuit board at back of plug pins and feed them through to back of main instrument board and solder to relevant points (check with meter what goes where). PS I carefully hacksawed off a large section of perspex on the speedo case to gain access - the only other way is to remove faceplate of speedo that's securely glued on and probably wouldn't survive intact if pulled off. Happy cobbling! BUT BEFORE DOING THIS check that you are getting a good signal from the diff hall effect speedo sender. If your ABS light comes on its a good bet you need to check those wires.

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Q: 1991 Volvo 740 speedometer odometer stopped working?
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