dude i am in the same boat as you zenki w/zenki sr. The wiring is the only thing holding me back from driving my new beast. Right now i am trying to diagnose a no spark/ no injector pulse problem. To answer your question, in the lower pic that you have those 2 relays are the eccs relay and the ignition relay. The small little gray thing connected to the 2 red wires is for the injectors i believe, Dont quote me on that though but i know you dont have to mess with it. It just gets taped up into the harness.as for the relay comming off of your dash plug and that other plug, i have no clue. I dont have that on mine, maybe its an automatic harness? or maybe its the reason i dont have spark or injector pulse, lol. Here is a color coded diagram that me and my friend were working on while going through fsm's and other posted pinouts. This is also for a zenki chassis.
http://i5.photobucket.com/albums/y18...out-Colors.jpg
take that and just move pins on the sr harness to the corresponding spots that are shown on the ka dash plug. Tip be sure to label all the wires on the harness before pullling them out and moving them.
Good luck! keep me updated!