Question on my oil pressure readings-happy father's day

My old duster ran 11.001 for 20 years. The gauge pegged past 100 lbs cold. Warn idle was 65 lbs. going down the track it was pegged again. Never had a problem. 440 with 6 pac rank, rods and pistons. 915 heads adjustable rockers. Super stock cheater cam DC oil pump with the spacer kit. Kim