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