The gauge you add on to the bottle similar to the mounted one pictured aren't worth the $$. I bought 2 a few years back for each bottle & found that they told me 2 things; full & empty.
Spend the dough on the changeover regulator & check it periodically.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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