common naming problem
Do I name the switch for its "normal" position when the engine is on or off.
It spends most of its time off and that is what Id see if I was working on it but "normal" is when the engine is on and up to temp and batteries are charged..... steady state running is normal. For house wiring it is what position it is in based on time.
So Clark, you got the schema of things right bu,t like most, you named it for what you are looking at not what you would buy in the store. The oil pressure switch is "normally" open