Found it !!!! choke heater switch

It finally came in the mail the other day. Will have to get a brass tee, and a short piece of brass threaded tube to plumb this in with an oil pressure gage. I checked it with my ohm meter. Shows open across both contacts with no pressure.
Mat, did you finish this up and if so have you any pics? Getting ready to install ld4b and edelbrock and need electric choke source.