The reason for the question is that I primed a rebuilt motor yesterday.  Made one B and D cheapo chordless smell so bad that it went into the trash.  Oil pressure quickly shot to 100 psi without any oil sign at rockers.  Put on another chordless, BARELY rotating, and finally got oil to the rockers, keeping pressure at 40 or less with the low rotations.  It was cold, about 36 degrees using 5/30 oil.  Will change the gauge to see if there is any diff.

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.