Dear Robbie,
Hope you're well. What you need is a replacement instrument cluster. Be advised: clusters from later 940s (i.e., 1993 and later) will fit into the opening but will not work properly. So far as I know, only clusters from 1991 and 1992 models will fit and work properly. You can have the speedo calibrated and the odometer re-set by an automotive instrument technician.
As to the in-tank send unit, you might try the following. Get a container of fuel system (not fuel injector) cleaner. When the tank is 1/4 full (or 3/4 empty) pour in the entire bottle and fill with gas. If possible, let this mixture sit for a few days. The solvents in the fuel system cleaner may dissolve some of the waxes that have accumulated on the wire-wound rods and the float, inside the fuel sender's barrel. I suspect that these waxy deposits account for some of the reported malfunctions.
Fuel system cleaner isn't costly. If it works, you are spared the task of replacing the in-tank send unti. This task is unpleasant, especially in a sedan, as access is via an opening in the trunk's floor.
Hope this helps.
Yours faithfully,
Spook
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