it might be a fuse
It could be the fuse, but mine is because the floater that measures for the gauge is stuck.
If its Fuel Injection U put a FI pressure gauge on the Fuel Rail.
The Ranger fuel gauge could have several problems causing it not to work. These problems include, blown fuse, bad wiring, loose connections, or a bad fuel sending unit in the fuel tank.
The Sears Ranger 105-20 16 gauge shotgun came out in the 1930s. The Sears Ranger shotgun has a 26-inch barrel.
Looking at my Chilton repair manual engine wiring schematics ( with a magnifying glass ) for the 1992 Ford Ranger it looks like fuse # 16 is a 15 amp fuse for the fuel gauge
The ranger has a fuel sending unit inside the gas tank. These are notorious for going out. Only way to change it is to drain and drop the gas tank or remove the bed. The sending units that I have been looking at cost about $100
Your gauge could be bad but more than likely it is the temperature sending unit. It is a fairly inexpensive thing to fix.
Bad oil pressure sending unit?
According to my Chilton repair manual , fuse # 16 is a 15 amp fuse for the fuel gauge on a 1994 Ford Ranger
The fuel gauge could be getting improper signals from the fuel sensor. The sensor is located inside of the fuel tank.