You must have 128 Torgue Tokens for this to work since it has adds the Extra Number Set after 127+
My guide for 127 torgue tokens then you must get 1 more token ingame for it to add extra set of numbers.
E7 07 is 999 code i highlighted it.
Here is Picture Before and After.
AFTER. You can see it added the extra set of numbers
Here is my Siren with 999 Tokens.