Nguyen netted his third goal of the season in the 24th minute when Chris Tierney found him with a pass at the top of the area. The Revs midfielder then curled a shot around a pair of defenders to land inside the left post.
Honduran Bengtson, who joined New England this week, came off the bench to double the advantage on a rebound in the 84th and the Revolution (6-7-4) stretched its unbeaten streak to five matches.
New York (9-5-4), meanwhile, remained winless streak at Gillette Stadium since 2002, a span of 17 contests.
2014: The Year in Music [PHOTOS]