Originally Posted by toymachine
For a while I though about building a reg tests, but after hearing what the threads weren't the standard 1/8npt it never happened. If you can wait I'll check on Saturday if that grub screw is for the input or output of the internal reg...
The actual threads for that hole are 1/4 - 28.. Would be easy to make a little piece that went from that thread to 1/8 npt for a gauge or even to a asa. I might work on that this afternoon.