The Gers will take on the Queens in the second leg of the Scottish Premiership quarter-final playoff tie at Ibrox in Glasgow.
Stuart McCall’s side will head into the second leg with a 2-1 lead from the first leg played away from home at Palmerston Park in Dumfries.
Clark is confident of getting the job done, but he wants the Rangers supporters to cheer on the players throughout the 90 minutes.
“I think it will make a massive difference,” the 23-year-old told the club’s official website. “The fans have been great through everything we've been through and they've stuck by all the players and backed us.
"It would be great to see Ibrox full again on Sunday as it gives you an extra 10 to 15 per cent in the game. I think Cammy Bell said it during the week. It makes you run quicker and jump higher and stuff like that, so it would be great to see it full.”
Rangers have some of the best fans in Scotland, and one suspects that all of them inside Ibrox tomorrow will be cheering on the players.
Although Queens have a one-goal deficit, their chances cannot be written off. An early goal for James Fowler’s side could make it tough for the home team.