I dabble a bit in this stuff. I restored a Tokheim 39 in Sinclair. You can find a lot of information from the oldgas.com forums: http://www.oldgas.com/forum/ubbthreads.php?ubb=cfrm
If you're in need of parts, there are several places. With a door, they are making repops. Gas Pump Heaven: https://gaspumpheaven.com/ is just one place.
For original stuff try: https://www.gaspumps.us/ Many other places out there. Just read through the old gas forum.