2014 XSport, in D only shows Tach / fuel / temp. If I hit a paddle +/- it will show the number of the gear(s) I manually go in to, but it will only hold whichever gear I select until the ECU determines my selected gear is no longer needed / appropriate. Then "D" takes back over and shifts automatically...this is when the number disappears and returns to the normal display.
The only exception I've found to this is when I'm in Sand Mode and I upshift to a higher gear, since Sand Mode holds lower gears longer, and won't go past 5th on it's own, manually selecting 6th is an option. "6" will display for about 5-10 sec. then go away, even though the tx holds 6th gear.