oil gauge on 1992 Mercedes-Benz 500SEL

when my mb500sel get up warm the oil gauge go under number 1 when is cool go up number 3 thas normal? something grown wit the pressure oil?

Asked by for the 1992 Mercedes-Benz 500SEL
I am assuming you are talking about the oil pressure when the engine is at idle. If so a reading of 1 or a little less is normal if when the rpm is raised to 2000 it goes back to 3 everything should be fine.
the oil pressure which is next to the oil filter or the wires that connect to it.