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If it were me, I'd be assuming that the top and bottom terminals, with the white part between them, would be the 12v and the signal wires. It looks just like the back of the CUCV voltmeter to me, with a resistor and everything. I'd expect the other two threaded posts were for mounting, though...

Why not try posting a Wanted ad in the classifieds? There are several members who have parts trucks from which to get such things. One is hillbillywizard. I think it would be much easier to get the correct part rather then figure out what needs to be rewired to make civy parts work.