The Rangers are averaging just 2.5 goals in their first three games. Ryan Strome and Alexis Lafreniere, the first overall pick in the draft, are off to slow starts. Neither has produced a single point yet. That's going to change. It could happen here against the Penguins, who are giving up 4.7 goals a game. 
Things don't figure to immediately improve for the Penguins defense either. Pittsburgh has a cluster blue line problem with only three healthy defensemen. The Penguins are going to be forced to use inexperienced players and low quality veterans to fill defensive positions. Their plight isn't helped by poor goalie play. 
The Rangers' net play has been spotty, too. The Penguins have scored three or more goals in three of their four games. 
The Over is 9-1-1 the last 11 times the two teams have played in Pittsburgh.