According to text from the book cited below, the organ was moved from the rear gallery to the front in 1886. It was electrified in 1938 by an undocumented person or firm and enlarged to 3-manuals retaining 14 original Johnson ranks. Subsequent rebuilds in 1988 and 2009.
An original installation. 25 registers. Identified by John Igoe, using information found in Johnson Organs, 1844-1898: Wm. A Johnson, Johnson Organ Co., Johnson & Son: a documentary issued in honor the two hundredth anniversary of his birth, 1816-2016 / by Scot L. Huntington, Len Levasseur, Barbara Owen, Stephen L. Pinel, and Martin R. Walsh. Cranbury, New Jersey: The Princeton Academy of the Arts, Culture, and Society, 2015.
Organ after being moved to the front in 1886: Photograph from an archival source: Church website, submitted by Jim Stettner. Taken approx. ca. 1890's
Organ in front [cropped]: Photograph from an archival source: Church website, submitted by Jim Stettner. Taken approx. ca. 1890's