I've check both hubs and there is no sensor on there but there is the below wire that is heading to the back of the gearbox, although I can't see where it goes.

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The wires that come out of this are below

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Which go int this block

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There seem to be a lot of wires coming out of that block, it is really difficult to trace then under the dash as its a bit of a dogs dinner under there.
I'm not sure what happens to the rest of them but below is what is at the back of the speedo.

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I'm not sure if I am better off knowing this or not.
Is all the cabling on the MOGs of this age a bit of a mess?