Dave
Autopilots Central may still work on these, they are in Tulsa, OK https://www.autopilotcentral.com/index.php/contact-us/
Also I think Jerry said he uses Muncie Aviation in Muncie, IN
https://www.muncieaviation.com/avionics
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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