hey man its really easy.. it sucks i just did my 2nd resister box install and i totally forgot my camera to do a wrietup... damn
anyways.. heres the deal.. if you wanna do it the clean looking way its easy... take the engine harness out of the car.. follow the injector wires.. now theres 8 wires on the injectors..4 of them will be different colors and 4 of them will be yellow with a black stripe....
i cut the loom off the harness.. you can see where theres a split so you can put it back on.. but on the injector side i cut the loom and then on the drivers side of the harness.. theres a plug with nothing else that plugs into it thats where the yellow and black wires go.. undo the looom so you can trace back the 4 yellow/black wires go for the injectors.. now what you do is cut it close to the plug...
on the dsm resister box theres 4 wires that are the same color and 1 wire thats a different color.. take those 4 wires and solder them 1by1 to each of the yellow/black wire off the injector.. then take the one wire thats the different color then the others on the resistor box and solder it to all 4 of the wires left un soldered that go to the plug..
i hope this helps you out... heres a picture of what im talking about
maybe next time when i do a dsm resister box install.. i will remember my camera to do a writeup