Nathan rfb

I have recently brought a R32 that had been manual swapped it had no wiring running down to the tranny that is supposed to Be next to the fuse box in the engine bay, the reverse light switch is not hooked up and the only thing I see the old owner done right was bridge the inhibitor so the car can start, does anyone have photos of wat plug and pinout is used for the to wires on the reverse light switch Also the 3pin plug in the middle wat is it for?