Awesome, this was basically my train of thought however I didn't know enough to make any real conclusions. It's good to know that I should be able to rule out the diff/box.
I will see if I can get my hand on a GTS-T cluster, I'd rather a GTS-T cluster anyway, while the red and silver dials are nice, the "Front Torque" dial is useless and just makes the car seem "ricey".
When I get my hands on one I will post the results up here and let you know.
Cheers!