I ordered Huma air & reg gauges for my impact. I can't see the #s on the 300 air gauge as well as the #s on the 250 reg gauge. Does it hurt to switch them & use the 300 for the reg & 250 for the air ? If I replace them does this affect my warranty??
I have those gauges and I had the same question that you have, so I emailed them.
They replied that you should always use the 300 bar one for the bottle and never the 250.
Because if you exceed the 250 bar when filling you go beyond the capacity of the gauge measuring, and that can mess with the precision of it resulting in possible non accurate measurements after that.
For the reg any is good because obviously you won't exceed anything.
Good luck!