67 Dart electrical problem

Gray wire is oil pressure switch or sender. Dk blue is coil.

Right off my stock 67 273.
So there is only the dark blue to the pos side of the coil and the black distributor wire to the neg side? 2 wires total? Oil pressure sending unit wire with connector broken off makes sense. I have a temporary mechanical oil pressure gauge hooked up at the moment so the wire was dangling.