Haha so I had a chance to check my fuel pressures and I think I am just going to add to the confusion! I have a 35 year old snap on gauge that (I am pretty sure reads low) says 43 and 47 PSI and I have a home built digital gauge (arduino based with oled screen showing min, max, current and average) that I built a couple of years ago that says 49 and 55.5 PSI. I never did check the calibration on the digital gauge and was going to check it against my Fluke pressure adapter (also about 35 years old) but I remember that something was wacky about the switch on the Fluke and never did get around to fixing that or going any further with checking the home built gauge.

__________________
1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)