Clark
Can you press or snap the guage out of the cover in order to clean it? I think I have seen do's like this but don't, at the moment, know or remember who made them. The guage is new to me on these but, I think, Wagner did make a similiar do. The cover, with it's two spout covers, is probably a double duty cover that was used on skillets and do's. I've seen other makes that used what looked to be a skillet cover on a do. I'm wondering if this is a Chicago Hardware Foundry piece. Can you post a photo of the bottom of pot and inside of cover?
Steve