Dash Oil and Brake Warning light - how are they triggered in the start function?

It’s a 70, and it’s a pretty standard thing amongst any mopar I’ve owned. Perhaps your car is a little wonkey. Jos51700 reaffirms what I’m Saying.

Hence, my problem is a little confusing, I just want to know what ground the circuit during cranking so I can eliminate that from my trouble shooting and before I change the switch prematurely
I think the oil pressure switch grounds the circuit, and oil pressure moves the contact and breaks the ground so light goes out.

Power to the circuit turns off with the key