Sunderland, who came back from 3-0 down to claim a 3-3 draw in this fixture last season, threatened Gollini's goal again as Callum Hope, played through by substitute Lynden Gooch, attempted to chip United's young Italian goalkeeper who did well to close down the angle, and Hope's effort floated just over the bar.
A whole raft of changes followed, with Kenji Gorre and Matthew Wilkinson entering the field of play, whilst the visitors were forced into a change in goal as Jonathan Maddison replaced the injured Dixon. Maddison was in the action almost immediately, and was lucky to get away with a clearance striking the back of Weir, the Reds being unable to capitalise on the opportunity.
Byrne almost added the killer second goal with four minutes remaining, but his shot was well turned over by Maddison. The substitute goalkeeper could not thwart Daehli at the death, though, as the young Norwegian slid the ball home to wrap up a deserved victory and claim the Reds' first home points of the season in the Barclays Under-18s Premier League.
The Under-18s are in action again next Saturday, as the young Reds travel to Southampton, and you can see all the action live on MUTV. Kick off is at 11:00 BST.
United: Gollini; Love, Rowley (Wilkinson 72), McNair, Grimshaw, Pearson, Weir, Rothwell (Gorre 72), Byrne, Rudge, Daehli. Subs not used: O'Hara, Evans, Harrop.