Two goals from Diego, who also missed his second penalty in the last four games, earned the Wolves a crucial Volkswagen Arena victory which takes them away from immediate relegation danger and, according to managing director Hoeness, could prove to be a turning point in their season.
"There was a lot of tension before the game since we played well last week, but did not get any points," he said on his club's website.
"We played well again and this time go the three points.
"I am very relieved about that. I am now convinced that we will be able to show in future that we can play really good football.
"It is certainly going to be more difficult in Leverkusen (next weekend), but I have faith in our side getting points there too."
The win was the Wolves' first at home in six attempts and it was Pierre Littbarski's first points since replacing Steve McClaren as coach.
He was also relieved to see his side hold onto all three points, especially when Gladbach reduced the arrears in the second half.
"We have gone through such a rollercoaster of emotions so often in the last six months that the relief is all the more greater," he said.
"It was very mentally straining on the bench in the second half."
Gladbach coach Lucien Favre admitted his side had deserved to lose, even though they came close to stealing a point.
"We played against a very good side and it was a deserved win for Wolfsburg," he said.
"We could not match them in the first half. We showed a reaction in the second half and could definitely have made it 2-2, but the defeat is nevertheless fair."
