If you don't mind a dead gauge, replace the stock sending unit with the sender from the new gauge. Too bad it isn't electrical, you could wire right to the stock sending unit.
If you want the stock gauge to work along with the aftermarket, you can get a Mr Gasket thermostat housing that has a port for aftermarket gauge sending units.
No, the current draw of a fan, needs to be on a relay. I have ran many of fans with just a toggle switch. The switches dont last long. If you use a Electric fan relay. You dont have to worry about the switch. Or it burning up. Trust me, they are easily forgotten, then it may be too late when you remember.
You have a dedicated power wire, that holds the fans amp draw. its usually on a fuse link also. The you have the relay trigger wire, which theres hardly any load on. All the trigger wire does, is energize the magnet inside the relay, this make a connection with the fan and the main power feed wire. You can get a relay like im talking about, at most parts stores. Some are preset to kick the fan on at a certain temp, others have an adjustable setting, for different temp ranges.
The temp probe, should go near the inlet hose. Which is the top hose on the radiator. About 2-3 inches from the top of the radiator. It needs to be submerged in water for accurate readings.:bigthumbsup
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