Hmm the gauge starts at zero, and then smoothly rises to 3 bar shortly after the engine starts up. No problems starting, no smoke, a bit of valve clatter for a few seconds, then it smooths out and feels good?!?

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT

My oil pressure gauge stays at 45 psi when cold, even at idle, and drops just a little bit on warm idle after easy driving. It drops down to about 30 psi after a good run on the freeway though.

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1976 240D "Katja"