NO, the center terminal is your resistance adjustment, aka center tap. Run a wire from the center terminal, to either outside terminal, then to the sender terminal on meter or gas tank. The other terminal will then go to ground, back of dash or gas tank ground, where ever you decide to mount it. Make sure all exposed wires or terminals are covered, heat shrink, tape, potted in epoxy, what ever when you are done.
That POT should work fine.
The center terminal or center tap is usually a little piece of metal or brush material (the same as used in an old generator) that rides on the resistance material, carbon, wire wound, etc.. If you've ever had your light switch out and looked at the light dimmer rheostat, aka POT, same thing.
Larry
