The gage on the tank can be removed as it is operated via a magnet on the float mechanism. The tank is still a sealed vessel with the gage off. The gage can be with or with out an electrical terminal. You can and probably will have to transfer the gage for your present tank to the new one.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7