oil pressure after rebuild

[captping]

first i would like to say thanks to rurouni motor was smoking pulled motor to nring and valve seals but found atf in intake valve sure enough vac mod on trans was bad but started project figured i would finish motor did have 225000 miles

now new prob start motor everything seems good after warm up lose all oil pressure if incress rpms goes to norm but let off drops to o in rebuild did put new oil in pump dist seems to be fine any help apprecaited