Start at the gauge, shown in your picture, and follow the ''wire'' (as you choose to call it) to where it connects into the engine in your other picture. Loosen and remove the outer hex nut (likely need a 5/8'' wrench) then pull the end out of the fitting still threaded into the engine. It will have a bulb on it. That bulb held the fluid that expanded and made the Borden tube, inside the gauge, flex and move the needle. If the tube was cut and has the ''electrical splice'', it was ruined. (Yes, some people have repaired these gauges, but I don't see that it is feasible or economical in most cases.) Looking at the cut ends of the tubing it would appear to be a solid wire as the diameter of the hole in the tube is small and the cutters would have pinched it shut. If the electrical splice is in the tube between the gauge and the bulb in the engine, you summed it up in your post where you posted; ''It has an electrical connection, but maybe someone was an idiot!''.
What Tractor is this on? The 1486 you posted about on the Farmall & IH Forum where wore out posted a wiring diagram for you? That diagram does show an electric gauge which would have been in a panel, not a stand-alone gauge you posted a picture of. Are you trying to get the original gauge (electric) located in the gauge panel to work? If so, this mechanical gauge has nothing related to that gauge.
If this is on a 1486 with an electric gauge panel, a stand-alone gauge like you posted would be something someone added if the original gauge in the panel stopped working. The added gauge, in your picture, has no connection to or need for the original electrical temperature gauge wiring. This video may help you understand.
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