Could someone please point me to a complete schematic?

 

This may be close??? But its for 1975 >>>>>> https://mymopar.com/wiring/

 

I suspect 1975 and 1976 are the same but nowhere does it show the bulb for the oil pressure dash light or any other dash light. It appears there must be another page that shows the inside connection to the "printed circuit connector". The oil pressure sensor connects to pin 11 of the connector. On the other side of that connector would be the wiring for the dash lights,

 

Yes the Printer Circuit stuff is harder to find.... Those are mostly in Shop Repair Manuals...