I wouldn't guarantee that it would work correctly, there's several hacks going on that are reading/writing to specific memory addresses in the game, so if for some reason the rfactor exe is different, then it might not work.
Merry Christmas! So, I now have a new computer. I installed rFactor and HydroMod and tested it out. The clock still doesn't work. I made sure to have DX9 setup in the Config, and I even ran the game as an administrator. Still nothing.
The G920 is compatible. I posted this before I knew about the Logitech Gaming Software. My G920 works fine, but force feedback pulls to the right, so I race without it.