Contact DAK and visit here:
http://web.mac.com/ethandunsford/DAK2/Radio_Room.html
Relative to rc tanks, Tamiya USA is really only helpful for stocking and packaging tank spare parts for UPS delivery.
Virtually everyone at SCAT uses your radio or the earlier version to run their rc tanks, just do some more reseach.
Also use the forum search function
here for your radio and you will find all types of tips to set it up to run your Tamiya tank.