Mystery bulb socket behind dash

Craig, I was wrong about the oil light. It is built into the circuit board. A 1970 Dart is different than your panel. It has two 5 prong connectors going into the circuit board pins. The brake warning light is at the left end of the panel, left of the circuit board. The light should come on with the ign. key in run position and the E-brake pulled out. From what I read, there were many changes during these years.