No unfortunately the gear number does not flash at braking points like it does on the in screen HUD, but great to turn off all the HUD on the screen to give a clear sight of the track ahead... and this gave me more chance to see/ decide on my own braking points around the track.
It’s only thanks to this thread that I now know that the display works with GTSport !!
I also found that there is a Bluetooth and firmware update available for it also, I’ve updated mine with no problem but couldn’t find and firmware notes to say what is new.
But for anyone else who doesn’t know just head to the Thrustmaster site and upgrade.