I just replace my Magnafuel brand low pressure fuel gauge on my race car Magnafuel 4 port regulator, it had drop to 3.5 lbs. with no evident issues on fuel delivery. The two little screws that held the outer cover on the gauge had vibrated out allowing it to slide down a little over the main gauge and it might have touch the needle at one time or another. The new same part number Magnafuel gauge with the cover tight showed 5.5 lbs. that I had set that regulator up with 5 yrs ago
My message is anything mechanical can go bad or be built defective, almost like men and women, huh