RTI Prophet 11

Hi shooters, its been a minute, hope everyone is fairing well.
So, one of my gauges is faulty, i think the fill gauge. I set the reg to 125 bar on the gauge but it shows 140 bar on the fill gauge when it comes off reg.
Could anyone please advise replacement for both gauges. I,m thinking WIKA , apparently very accurate, (unlike my shooting :) ) but i,m uncertain of size and thread size.
Thanks.