Its really rather simple:
1) there is a COMMON end of the resistor pack, where all 4 of the resistors are tied together. That needs to connect to the heavy black/white striped wire under the hood that powers the transistor and coilpack for +12 volt power.
2) the other end of each resistor connects to the positive end of each injector, and the ECU drives the other end to ground to fire the injector (polarity doesn't matter).