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Dear Phils94850,
Hope you're well. I'd guess the problem is in the instrument cluster itself. Is the speedometer's needle slightly canted - and so unable to move freely - perhaps as a result of someone being careless, while doing work inside the cluster?
Failures of speed sensors are not common. Yours seems to work consistently, yet you don't get full speed indicated. Most often, sensors stop working entirely, or may work only intermittently. Vibrations, presence of moisture, and/or changes in temperature, etc., can drive intermittancy.
When a sensor works consistently over the full range of normal driving conditions, it likely is in good order.
Thus, I'd try to find a replacement instrument cluster at a salvage yard. Be advised: speedometers from 1995 and later model years will not fit into a 1992 cluster, and such clusters will not fit into a 1992 car (different type of connectors from the wiring harness to the cluster).
Further, if you want to substitute an entire cluster, not just the speedo itself, then you must find a cluster from a 1991 or 1992 car. A gas gauge change in 1993 and later clusters makes these later clusters unsuitable for 1991-92 cars. Specifically, a 1993 cluster's gas gauge will not work at all in a 1991 or 1992 car.
To get the donor car's speedometer mileage adjusted to your car's actual mileage, you'll need to send (or take) it to a shop, that works on auto instruments. I had good results from APT, at www.gaugeguys.com.
Hope this helps.
Yours faithfully,
Spook
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