Today was miscellaneous wiring so that you can turn the passenger side airbag on when you have a passenger in the seat (OEM seat has sensors located in it). May end up removing the airbags down the line, but for now I'm planning to wire everything so its operational.
On the left (black box) is the Occupant Classification ECU. Wiring that comes off of it hooks up to harness under the seat and passengers seat belt. Wiring on the far right is what comes off the other bung on the OCS and runs to each of the 4 sensors on the passenger side seat. Wiring in the center replaces all the wiring on the right with a switch that allows you to manually turn on and off the passenger airbag. (sorry for the quality - iphone camera wasn't working so well)
You also need to cut the yellow wiring under the seat which is for the OEM seat side airbags. Since the sparco's don't have any side airbags you just need to wire in ~3ohm resistor to complete the circuit and hook it back up to the harness on the floor. The resistors allow the ECU to believe the airbags are still there. Sorry didn't grab any photos of this
Driverside seat installed