Gangjee, a rookie, had five birdies, an eagle and a double bogey in a tournament that has always been good for scoring.
Gangjee started on the tenth and birdied the 14th but quickly gave it away with a double on 15th before he birdied the 16th and eagled the 17th to turn in two-under 34.
In the second stretch he birdied the third, eighth and ninth to finish at five-under.
Daniel Chopra, meanwhile, shot 67 and was tied 39th with one bogey and five birdies.
Seasoned Tommy Biershenk carded a career-best equalling nine-under 62, while Elliot Gealy shot 63 alongside Matt Weibring and Aaron Goldberg.
Nine players are also tied at 7-under 64.
Gangjee opens with solid five-under 66 at Nationwide Tour
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