ParkMe only lists those that have a docking system, that's probably why T3 is missing from its list, but FSX does recognize T3 gates if, with "recognize" you mean being able to select them from the Go to airport menu, and being directed there by the ATC. Just, they are not *named* T3.
If might be best if you use a program like the free ADE (Airport Design Editor), to visually identify on the map how they are named in the AFCAD.