When measuring the FP you disconnect the vacuum line right?
How do you know when its adjusted correctly? Like say 45-47 or 47-49lbs. Is there some way to tell, BLM'S or something using a scanner? How do you know for example 47lbs is better than 45lbs or 42 or 52? Thanks for your help.

 

I tested mine on a dyno. I tried it at the track but there are too many variables.

 

ttt

 

You only want to set the fuel pressure to what gives you the best WOT performance, like on a dyno as DannyT said or at the dragstrip.

For cruising around, a fuel pressure change will result in a change in the BLM, after 15 to 20 minutes the BLM value will stabilize.

If we could count on our inaccurate O2 sensors, I would find the fuel pressure that gave me 880 to 890mV from the O2 sensor when at WOT.