New Zealand Datsun Club

I fitted an oil pressure gauge today that reads in Kg. It sits around 4 and raises to over 5 when my revs are around 4500Rpm
Is this normal as 4bar = 58 Psi and 5bar = 72 Psi.
I asked a few people who all gave me different answers to what the A12 should be. My car uses a little oil but doesnt smoke and seems to run ok except for being slow.

KG/cm2? 4 Kg/cm2 is 56.9 psi and 5 is 71.1 psi that seem a little high check the ball hasn't seized in the oil pressure regulator maybe? the weight of oil you use will affect the pressure also.

Sorry Kg/cm^2. Gauge only says Kg/oil so would say its cm^2.
I use total 20/50 and will check the pressure regulator valve tomorrow.
It actually went above 5 today which was kind of scary as the gauge maxs at 6.