McAllister said: "We know there is a lot at stake. If we turn over Walsall we go above them so my advice to the players is to lose themselves in work, enjoy the challenge and rise to it.
"We will have the TV cameras here and a big crowd so these are the kind of games that should inspire players."
United were booed off at the end of their last home game, a 2-1 defeat against lowly Cheltenham, and McAllister is looking for a united front tomorrow.
"We need everybody pulling together," he added.