Air Venturi Replacement gauge for avenger

The tank pressure gauge on my avenger gave out a few days ago. First thing I noticed was that my hand pump gauge wasn't nearly matching up with the gun gauge (It did earlier). Also the force required to pump suggested that the pump's gauge was correct. The pump gauge also matches quite closely with my notos. At first I thought it was maybe a bad check valve somewhere but now the reg pressure gauge is also showing higher than the tank gauge so I'm fairly sure it's the tank gauge. Here's the a list of what I've found so far. OEM replacement set $50, AEA $20, Sekhmet $55 and some cheap ones on Amazon ~$10. Do you have any other suggestions? If wika had one with the correct thread size I'd probably go for that but I don't know of any. Would it work drilling out the hole and tap it for 1/8 npt? Thanks