Low oil pressure makes me nervous

X2 I had the computer in my wifes old 4.0 jeep shut the motor off one time because the gauge hit zero, the sending unit was crap, changed the sending unit and put a "t" in it with a mechanical gauge just for a sanity check, pressure was fine.
mine is off each of the rear pressure ports, one 1/4" , and one 1/8" , they both read the same.