The problem is that wouldn't solve the issue with the insurance company. A 3000psi COULD still be fitted to the 4500psi rig to be filled.why cant they just use another stick :/ ie at the masters they put a sticker on your guage to show if its in test date or not, cant they just wrap white or black tape round the reg to show 3 / 4.5k and then have 1 black and 1 white hut to fill up in, and 1 person standing to make sure whites go with whites and blacks go with blacks (in a non racial way obv)