makin sure...

im just douple checkin to be positive, i got my new low impedence injectors and resistor box. i just started wiring it. now the four black wires on the resistor box go to the four black/red wires on each injector right? and does it matter which injector goes to what wire on the box? and my last question is does the red wire on the box go to 12v positive or the ecu? i seem to think it goes to 12v positive but someone said it goes to the ecu and got me all confused. i just dont want to get messed up cause of how important it is. thanks guys