I would give Consolidated Instrument of Teterboro Nj a call. They have been in the business since 1946 and have an excellent reputation. They have serviced our instruments for a long time and are very good.
Ask for Eric Johannssen or OBJ Johannssen and tell them that we referred you.
http://www.consolidatedinstrument.com/
Located at Historic Teterboro Airport
510 Industrial Avenue
Teterboro, New Jersey 07608
Phone: (201) 288-1189
Fax: (201) 288-8006
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Kevin Kearney
Vice President
Berlin Airlift Historical Foundation
C-54D "Spirit of Freedom" 43-17228
C-97 "Angel of Deliverance" 52-2718 (painted as YC-97A 45-59595)
C-54E/R5D-4 "Spirit of Freedom" 44-9144 BuNo 90414 (wfu April/2020)http://www.spiritoffreedom.org