Edit: Please disregard this post as I didn't fully ready the initial question and assumed supply when pressure was questioned.
The oil filter bypass is the pressure drop across the filter element. Do not try to equate this to pressure in the system.
Just referencing the gauge which tops at 5 ATM (73 psi) my car typically pegs the gauge when above idle, so you can assume the system pressure is in excess of 73 psi.
for reference the min oil pressure at 5000 RPM is 5 ATM.