I got a liquid filled fuel pressure guage... My question is on the end of the thread where you actualy screw into the fuel pressure regulator there is a valve type thing that you can screw in or out with a pocket screwdrive... Is this presure valve? do i adjust it before i install it? somone please help... sorry about the camare im having a problem with auto focus....

 

i think my marshall fuel pressure gauge has the same valve......leave it in there......it works perfectly fine with that valve in there.......dont know what it is for but im sure it's there for a reason...

 

ya im not going to mess with it i was just wondering if i or the tuner would have to tweak with it