Thats about all you can do with a case that originally had a fuel pump.. Or you can leave the fuel pump guide in pl;ace and leave the galley plug alone, with the guide in place you'll never expose the out galley to pressure...
I had to replace the original oil plug, because behind it there is an engine oil system pressure. Only way to get the security to the oil system was to remove the fuel pump guide also and install the new oil plug deeper to the case. I also have to plug the fuel pump guide hole from inside the case and seal the oil return line from the fuel pump mounting area.