As was said earlier, getting inside is definitely key. But so is making sure you don't fall victim to that right hand when restarting or resetting is also a must. Constant circling away from that right hand is key, and heavyweights may not bend at the waist as often anymore but you need someone who is constantly keeping their head way off center. When Ortiz got caught in the rematch for example he parried and slipped but not dramatically enough and he was still in-line for the right hand. Constant side-stepping before feinting and slipping into the inside.
Feints in general are key as well. Wilder really waits on his opponents, studies them, and either punches with them when they committ, or spams the 1-2 when they're not a threat at the end of his shots. The trick is to constantly feint so he can't time you well. Make him commit off balance, then counter. Disguise your own forward advances.
Fury would do well to incorporate some of this into a rematch. He boxed well enough the first time, but this time he should also capitalize on clean shots with follow-up combinations at close range. Lean on him, punish the body.