Is this boost gauge display able to be activated in any settings on a 2016 Gti 
Assuming that you have MIB2 now and that the boost gauge is running on MIB2 and not MIB3, then yes, flashing your MIB with the new software almost certainly will cause it to appear. I doubt if VW will do it for you, you would have to wait for someone to post up the software image - which does happen - VW vortex is a good forum to find software hackers

There are rumours that the FY17 has a MIB3... in which case, nope, you won't be getting it ever.