hey, about a few weeks ago I noticed my oil pressure on my auto meter mechanical oil press. gauge reading 1 or 2 psi lower than normal. i have a b16a that used to max out at 77-78 psi at 3k and 22-24 psi at idle; under normal driving conditions. Now its at 74-76 psi at 3k and 21-23 at idle. Ive had the motor for almost 2 years now and Ive taken excellent care of it. Im worried, could it be normal wear n tear? ive have a few ideas to get the pressure back to where it was , could replacing the oil pan gasket and pvc valve work? By the way, it doesnt leak oil on the ground and sometimes the gauge reads what it used to? im really confused and worried ,pleasee help? thanks (always changed oil before it gets dark brown)