360 magnum O2 sensor install help

Pins 2, 3, and 4 do not go through inline connectors or the PDC. They should be in the harness somewhere. Pins 2 and 3 do go through splices, and pin 2 actually goes to the ground G105 on the left front of the engine, and actual ring terminal mounted to the engine itself.
Pin 1 of the O2 sensor does go through a splice, and then an inline connector C130, and then to the PDC to get power from the fuse for the O2 sensor heater.