For information about differences between the NVG 242 HD AMG and the standard 242, click here:
http://www.flashoffroad.com/features...Jeep/tcase.htm
As for electronically controlling the TCase - you'd have to retrofit another TCase to do the work. The 242 is lever operated (one of the requirements of the military), and therefore isn't electronically or electrically controlled.
You could do the one out of a Duramax/Allison combo, and have a drivetrain shop do the swap and mods.
-Steve