Bf 110 cockpit, Wahlschalter and bomb load.

[Kodoss]

Those are levers for cleaning the oil filter.

If I understand it correct it has a rotating filter in which the oil is pressed. This filter can be closed through dirt or abrasive materials of the engine. To clean it, you move the lever from one position to the other to move a brush, that will clean the cylinder filter.
I took that knowledge out of a DB 601 E-G handbook. But I think the principle will be the same on a DB 601 A.

Just more workload for CEM.

Edit: It states Anlaßpumpen (starter pumps), which is wrong labeled. The Anlaßpumpe is below the hinged metal sheet on the right side of the Fuel selector (not Pumpenschalter).