The fuel gauge sender together its float is spot-welded onto the fuel pump and both are located inside the gas tank. There is no gas gauge-related sensor on top of the tank.
Check the big square electrical plug on the driver's side of the gas tank, maybe you knocked it partially off or damaged its connector. You can get to this plug with the Jeep sitting on the ground, no need to drop the tank to get to it. This plug is what provides power to the fuel pump and connects the fuel gauge sender circuit.