Last weekend, the right-back played his part in the Iron’s opening goal with a well-worked corner to Funso Ojo, who volleyed the ball home.
The 32-year-old is hoping he can continue to contribute to wins.
McMahon told iFollow Iron: “It is always nice to get an assist, but I think the credit has to go the gaffer (Stuart McCall) and he tapped myself on the back after the game.
“It was something that we worked on and Funso hit a couple over the fence, but it is always nice when it comes off on a Saturday.
“It was a great finish from him, I just had to put the ball in an area and he did the rest.
“I like to take all of the set-pieces. I got a few assists last season and have already got a couple this season. It is something I enjoy doing.”
The Iron have won both games McMahon has been involved in since his loan arrival from Oxford United, which has seen him play alongside captain and former Bradford team-mate Rory McArdle again.
“It has been easy to settle in,” said McMahon.
“I knew a few of the lads, I knew the manager and Kenny (Black). It has been an easy place to settle in at with a great set of lads.
“Rory is a great lad and a great player. In the past couple of weeks when I have been next to him, he has played really well.
“He was one player that I kept in touch with and he is playing well at the minute.”
The win at Walsall last weekend moved United up to 15th in Sky Bet League One and everyone is “buzzing” in the squad ahead of the Sunderland clash.
McMahon said: “We are on a good run ourselves and it is a game everyone is looking forward to. It is a big game and it will be tough, but the place will be bouncing.
“They are a good team, but so are we. We will worry about ourselves and if we play well at the best to our ability, then we are a match for anyone.”
It is set to be a big crowd on Saturday at Glanford Park and McMahon reminisced about his debut a couple of weeks ago against Coventry City.
He said: “It was brilliant and Glanford Park has always been a good ground. The atmosphere is always good when you come here as an away team.
“I would rather play here at home every week, as the fans get right behind us.”
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