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Dear Habib,
Hope you're well and stay so!! Before trying to separate the the speedometer wiring harness connector from the sensor in the differential cover, soak the connector with PB Blaster, Kroil or a similar penetrating oil.
These oils need time to work their way through micro-channels in the corrosion, and so weaken the corrosion bond. Repeated soakings at daily intervals is helpful.
If the wires no longer are connected to the harness connector's contacts, you'll need to remove the contacts from the sensor's round pins. Here, too, use of a penetrating oil will help.
To grip the contacts, you'll need a needle-nosed pliers with a 45° or a 90° bend at the tips. Grip the contact and try to turn it slightly, rather than trying to pull it upwards. With persistence, the penetrating oil will allow you turn the contact - breaking the corrosion bond - and then to remove the contact from each of the pins, by turning the contact, and gently pulling on it.
Once that's done, you'll need a short section of wiring harness with two-pin round connectors and a connector housing that fits into the sensor. Each wire of the replacement wiring harness will have to be spliced onto the factory-installed speedometer wiring harness. I'd slide heat shrink tubing over each wire, solder each wire of the replacement wiring harness section, and then apply heat to the heat-shrink tubing.
Once that's done - and your verify that the speedometer works properly - get some butyl rubber tape (auto glass stores likely have this item), and wrap this tape around the end of the wiring harness and the sensor's top. Overlap each turn.
Butyl rubber is very sticky and remains flexible for many years. With finger pressure it can be shaped into a protective "boot" to protect the wiring harness connector-sensor area. This will keep water from again damaging the wires.
Hope this helps.
Yours faithfully,
Spook
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