Alternator wiring help

[Mzag]

Hey guys, I've searched all over for an answer and can't seem to figure this out. I have made custom harnesses for my engine/chassis(rb25 s13) and need to figure out where the white/red wire from the alternator plug goes. I know the other wire (red? White?) goes to a constant 12v source and in the factory wiring the w/r goes to the bulb check relay then to the cluster light. I have made a cluster so that light is no longer in the car.
So in my searches I've found one person who connected the w/r wire to constant power using a resistor to drop the voltage to 6v. I've also read that is not the best option so that's where I'm stuck.
Any help is appreciated, sry for any confusion.