Bear with my explanation and find a difficult problem.
I bought a '57 Ranchero a few months ago and the temp gauge read comfortably low but the fuel gauge was showing about half what I was putting in the tank. Then my turn signals stopped working at the same time my ignition switch required a bit of push in or pull out while turning to "start".

Did figure the original switch was going bad and ordered up a new Motorcraft. Went to install it and low and behold the existing switch looked nearly brand new BUT WAS FALLING APART. Someone had put in some cheap foreign switch and the manufacturer failed to adequately crimp the four metal tabs. It literally fell apart in my hands.

Motorcraft switch installed. Gauges read properly, turn signals work. They are powered through the ignition switch

Moral of story: Please buy American made stuff, especially electronics, whenever you can