Massey Harris 33 oil pressure

I have a 1954 Massey Harris 33 that I'm working on. New clutch and rear main seal. My question is what should the engine oil pressure be when warm?

Happy Easter Howard
 

Operators manual I have says "10 to 20 psi at normal operating speed" I've had lots of old Masseys and they were all in that range, unless it was well below freezing; then you might see 30 psi
Ben
 
Speaking about oil pressure, what was the original range of the pressure gauge? I can find 0-30; 0-50; and 0-80 and many 0-80 gauges are listed for 44's, but that seems very weird to me to use a 0-80 gauge for a tractor that never go over 30PSI.
 

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