I missed the Low Oil Level part.
I have seen none for the 617 or 616 Engines.

Some of the later Mercedes Diesels have the Low Oil Level indicator. However, that does not solve the issue either. If something happens and the Oil Pump does not work you Oil Pressure will stop but you will still be full of Oil.

From what I have read more Members have had loss of Oil Pressure from the Hoses leaking than from the Oil Pump not putting out pressure. So it is possible that a Low Oil Level Indicator would be a good idea if someone would come up with a way to retrofit one to the older Engines.

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84 300D, 82 Volvo 244Gl Diesel