Like the title, im just not sure, also should i replace the filter too? How much for filter

 

Help meeeee

 

No you dont need it. Whatever the pressure is at now (unknown) is whatever you will tune at. The gauge is more for diagnostic. However if you have an adjustable FPR then you cant ever adjust it or the tune will be off.

 

if i don't have a fuel gauge how will they be able to tell my fuel pressure? also i do have a adjustable fpr

 

If you have an adjustable regulator, yes, grab a gauge. Without it, your tuner will probably be annoyed at best.

 

Who buys an adjustable fuel pressure regulator without a fuel pressure gauge? What was your plan - Just slap on parts and blindly adjust them?