Its never gona effect the guage as that goes up to 5k psi, but it may effect the pin.
I have to say i would recomend just taking a pin and piercing the burst disk, the lower pressure one of the 2. Point it in a safe direction and give it a bit of a tap with something. It should pierce the burst disk, which in tern will blow out all the air and then you can send the reg to tom allen as he is a bit of a god!!