No oil pressure after approx. 30 min. service life

Hello, Juniors Y22XE does not have any oil pressure after the oil change when starting. Only after a speed increase to approx. 2.500 1/min for a few seconds the pressure increases and the lamp goes off. At the immediate new start, the lamp goes off immediately after the start. Filled oil LM 10W40 – oil is enough inside. After reading the thread No oil pressure with cold engine I did not really come to a solution, because of the TE no feedback is available (or I have In any case, I will change the oil pressure switch prophylactically. I will also renew the filter, whereby it is illogical for me that the problem lies here – because what is pumped into it also comes out again – but it is the only part that was dipped during the oil change and before that everything was in order. As the last thing I must then remove the oil pressure control valve. Is there perhaps any other tips that I have not found? LG robert