I really dont like the one gas cap look ! I am thinking on adding a dummy gas cap but cant find one to come close to matching ? Anyone else have any ideas ?
I don't mind one cap, but I dolid have a vintage bike enthusiast ask me if I had thought about adding one. Probably the best way is to find a used Drifter cap, grunt the bottom flat, epoxy a flat plate onto the bottom and use good 3M double-aided tape trim adhesive to mount it. It won't look identical because it will lack the indent in the tank itself.
I think it would be easier to find an aftermarket tank with two caps and modify it to fit your frame.