All those little gun mini-regulator things....

[vw1]

I have a gauge I connect inline at the gun, set the pressure at the wall then remove the gauge to stop it getting in the way! I used to leave it on but though time it got overspray & thinners splashed on it making it unreadable!

Just a thought but does it not depend on the length of your soft line and pressure difference to your gun after setting pressure at your reg at end of hard line ?

 

[The Z'eer]

These A.N.I regulators are supposed to be good I haven’t used one myself but believe @Burdekin uses them

So do I, pretty good although it's my first and nowt to compare it to but it works well