Dave, wouldn't a 54 and beyond use a 60 PSI gauge? However isn't that about the same time they changed the gauge design? It also says it is for 12 volt, (I think) the ammeter wouldn't care if it was 6 or 12 however the gas gauge would have to be 12 volt specific (here again I think this is the case) So I don't really believe it is an actual NOS set that has been in the box for 68 years as stated. But is a decent looking set nonetheless.
