I just completed the break in period with the 327 so not much mileage.
I would imagine its been this way with the pressure since I got it running. About 4 months now.
I don`t know. I do know I am about to run another oil pressure line
for my 58 with a 327. Its a fresh break in too. This time a copper line.
Not that it matters. I`ll see how the old gauge on it works.
Note on the 59, its only 1/2 quart low and 10w 30.