Fox are updating their youtube chanel really regularly these days and their guy Jordi always uses a digital shock pump and reads off the gauge as if it were gospel.
If youve got good modern forks and you need the best out of them it definitely pays to be on top them. 2 psi either way can make a difference for sure, so does your fluctuating weight.
I over inflate then use a pressure gauge to bleed them down the number i want 👍