M/F 135 oil pressure ?

[double hunter]

Just bought a M/F 135, 4 cyl gas, (1964) nice tractor and runs great, the oil pressure runs a 20 psi, a buddy of mine was looking at it and said he thought that was low, my question is what should the oil pressure run

 

[David Devuono]

Is that the oil preasure at max RPM or idle? Could be the gauge, could be trouble. I had a low oil pressure issue with my Diesel MF135, almost junked the tractor before I discovered that Diesel was leaking into the block via the lift pump. Fixed the pump, changed the oil and all okay now,. IE right after oil change pressure good and as the weeks go by it got lower and lower. Doubt it would be the same with a Gas tractor, have you changed the engine oil yet?