It’s somewhat easy.
Westinghouse has 43 and 44 relays for open and close
Their are usually spare contacts on those relays they are the EC type.
You will have to run a voltage common signal through those so the GAL MOVFR gets the signal. Also you will have to mount in the controller a DOL-door open limit relay and a DCL door close limit relay. These are driven by the signals from the Gal door operator. Put the contacts in the circuit where the old Westinghouse open and close limits were.

I have done this many times on the Westinghouse controllers as as other manufactures Dover-Otis-Montgomery-Schindler MPH-300A