You can recalibrate your pressure switch. Remember you don't have to use a specific pressure switch. You really don't want to stop at 120 psi because with scatter it might be 121 psi the one time the inspector is watching it. Those little pressure gauges aren't that accurate anyway.
With all the exploding air tanks, regardless of reason, expect the inspectors to be particularly diligent and narrow in their interpretation of the rules. To get the sticker you will have to conform to their interpretation, not yours. That is just is how life works.
