Justin Mund

Hey Guys, sorry if this is off topic but I can't find anyone that can give me an insight on this. I bought a '67 with the dauntless. It has the original 10 gal fuel tanks and vent valves and selector valve but the placard is gone. Does anyone know what the positions are for each tank? I know it sounds simple but I can't seem to figure it out just running it and changing around 360 degrees. Any help would be appreciated. J. Mund