Long gone I assume? But replacement gauges on every corner! I got it for $5.00 at an estate sale about 10 years ago. Thought it was a propane tank like plumbers used to use. I have a Prestolite torch set in a metal box & thought it would be neat to use the 2 together. When I started looking for info, found reference to the carbide headlights. Even if the gauge was replaced, it would probably need certified before someone would fill it. It looks good standing under the workbench. I just enjoy surrounding myself with stuff like this.