Since I know the oil level is fine, I am not too concern now. It is just annoying. I too sometime back thought that as long as the oil press. was good, then all is good. That is not true, pressure is not indicative of level. That is why you have both a level sensor and a pressure sensor. The 2 are related, unless your pan goes completely empty and there isn't any oil to pressurize, in which case you have bigger problems.
On the subject of instrument clusters, what is the difference between the one for a wagon vs sedan?

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member