Low oil pressure makes me nervous

My 97 Ram 1500 has a 318 in it with 152,000 miles. Had bad mains, so i put main bearings in it and new HV oil pump 4 years ago, as a temp fix. Oil gauge goes midway when cold and drops slightly below mid when griving with 15w40 oil in it. Gauge started bouncing about 2 summers ago, and i thought the motor was done. Sending unit was bad. Changed it, still the same pressures as before.
For kicks one day a few months ago,i dropped the pan again to check the bearings. They still looked brand new and from then on i don't worry about oil pressure. Long story short, if you're concerned about the pressure, mount a mechanical gauge on it to verify if there is any doubt to wether the inaccurate factory gauge is correct or not.