Wiring colours my99 turbo 2000
 

I'm at the final stage of installing a prosport boost gauge with an a pillar pod into my my99 turbo 2000 but am unsure which wires to solder the gauge wires into. I have the cable (orange, black, red and white wires) fed into the loom next to the fuse relay box, I know I don't need the orange wire as I'm not bothered about the gauge changing colour but I'm unsure what the subaru wires represent (i.e. which is positive, negative, perm live etc) and I can't find the info anywhere!
Any help appreciated!