To the OP..... I would not have bet on this being factory, buuuuut.....
The mymopar schematic does show the oil and temp sensor wires NOT passing via the bulkhead connectors... they just show up going from the passenger side to engine side of the firewall in some unmarked fashion and are violet and grey wires for temp and oil respectively. So maybe so. The blower motor wire is shown as dark green.
The red fusible link goes ot the firewall..... but I wonder if someone did a mad-electric-like bypass.....