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Your speedometer needs new capacitors: see the FAQ article on repair of speedos. Here is the new article on interchangeability:
Speedometer and Cluster Interchangeability. [Randy Starkie] With reference to the 140mph speedometers in 700/900 series cars, the 1991 and 1992 instrument clusters and their speedometers are the same. 1993, 1994, and probably 1995 are all the same but different from the 91/92. The speedometers from a 91/92 cluster will not swap with a speedometer from a 93/94/95. It would appear that the 960 cars share the same cluster with their respective 740/940 cousins. I was able to swap a speedometer from a 92 960 with a speedometer in a 92 940. Turbo cars require the tachometer/boost gauge to be swapped into a replacement cluster from a NA car.
Caveat: the fuel gauges are an exception to this rule. The fuel gauges are definitely different and will not swap. The gauges on the 93-95 cluster will read empty when the cluster is installed in the 91-92 cars.
While speedometers will not swap between the already noted clusters, I believe entire clusters will swap across the 91-95 models with the exception of the fuel gauges. The clocks are a wild card in that some are controlled from the dash and others through the bezel. I did not investigate the cruise control. 91/92 have a male spade on the speedometer and the later cars have the spade on the back of the cluster- I would guess both are providing the same needed signal but I did not have the opportunity to check this out.
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See the 700/900 FAQ at the drop-down menu above right.
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