There is tons of info online if you just search.
Google "rb25 neo into r32 wiring" and you'll have a bunch of links.
Not sure if you can link other forums here, but here's a quick one: https://www.sau.com.au/forums/topic/284 ... nversions/
Realistically all you need is a pin out for an rb20 and another for a neo and you should be able to figure it out. If you can't, don't be cheap and buy the wiring specialties harness that is plug and play and save yourself the trouble and headache.