The second deer tag can only be used during the prescribed second deer season. You cannot use your primary deer tag for the second deer season unless the seasons and other restrictions happen to overlap.
"You must purchase a second deer tag to participate in this hunt and only the second tag can be used in the second deer permit hunt. The second tag must be the same weapon choice as your first tag. You may hunt only with the hunting method in compliance with your tag."
The second deer tag will cost $68.
Good luck on your hunts.