One other thought that probably wont apply since you are going with a low pressure system is that the valves on pressurized oxygen tanks will leak oxygen out around the valve stem unless the valve is all the way open or all the way closed.
If you only open it enough to get a good reading on the gauges the oxygen gas will leak out and you can have an empty tank in a few hours even if you shut off your torch.
I only mention it here because of the topic and that detail rarely gets talked about elsewhere.
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