It is outdated. You can use the screen as described, but it is much quicker to roll the right steering wheel button up/down to adjust TACC speed. You can also

It is outdated. You can use the screen as described, but it is much quicker to roll the right steering wheel button up/down to adjust TACC speed. You can also push it left/right to adjust follow distance. I rarely touch the screen while driving my Model 3 (or while my Model 3 is driving me).