James Dean completed a fantastic double in the second spell by ghosting over untouched from dummy half while hooker Hane Rudolph also bagged a great double.
"It was a fantastic performance right across the team - these guys from Kaitaia, Kaikohe, Dargaville and Whangarei are all putting their hands up for greater things," he said.
Winger Pana Matiu and Ioane Job completed the try-scoring while skipper Daniel Fullop kicked two conversions. Centre Kaleb Atkins and second rowers Gabe McBinney and Haimona Gierney were standouts while the four props deserve special mention after winning the battle up front.
"They drove the ball up the middle all day and made great yards, with Otaua's Piri Croft in particular continuing to improve with every game," he said.
The two top teams in the competition meet in the final and with Counties, Auckland and Northland only separated by points differential making the clash between Auckland and Northland at Cornwall Park on Saturday the decider.
"We've got to beat Auckland to make the final and I know we can take them with the frame of mind we're in - they've just have to get past the idea that Auckland are unbeatable.
"They won't be able to beat them if they psych themselves out and that's my job - I'll be spending the week trying to psych them up for the game," he said.
The injury toll continues to rise for the side but Selwyn is hopeful that none of the injuries sustained this week will keep players away from the Auckland game.