i have a stupid question i am doin a zc swap in my 1990 crx and my friend gave me this resistor box and it has 1 red wire and 4 blacks does it matter witch black one goes to witch injector and if it does how do u figure it out is there a diagram or something this is all i have left im just making sure

 

shouldnt matter. all it is doing is changing the the voltage going to the injectors. it has nothing to do with firing order.

 

if your car is not a DX, you already have a resistor box...
If it is a dx, you have some extra wiring to do.