You can use this adapter to connect your computer depending on your design plus you want to your first stage plus many other uses
On one end you have a 7/16-20 end we had a small high pressure hole made so you do not need a spool to use with this fitting and the other end is a 3/8-24 male threaded fitting!!
This adapter uses a buna o-ring but you can always switch after using it for a while with a viton if you need too