POS Integration w/Fuel System / Gas Sales

About to embark on purchasing a POS system for our full-serve wash and detail system. Challenge is we also have 3 fuel dispensers where we take credit cards at the pump and prepay inside at cashier desk.

Has anyone integrated in full or in part their (DRB/Micrologic...) POS with the gas sales system (Verifone Ruby). I understand they don't integrate fully and want to know how one might incorporate manually or in part

Hope this makes sense....

KT