what i would do is calibrate them by swapping them around, the reg one to the bottle one and cross referencing them to a known to be good one/on the cylinder for example.
then you know on which gauge what number is what real pressure.
the numeric value does not mean anything, as long as you use it as relative, add more/reduce some it will still serve the purpose.
then you know on which gauge what number is what real pressure.
the numeric value does not mean anything, as long as you use it as relative, add more/reduce some it will still serve the purpose.
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