phase 1 to phase 2/3 rear light conversion

[ozonehostile]

As I cant seem to find any clear information about putting phase 2/3 rear lights onto a phase 1 i thought i would start this for my own use and for people doing future conversions.

first of all, i know that the light itself is a straight fit, but from there im not so sure.

what wiring differences are there between the different phase rear light clusters?

what do i need to do to wire in the lights?

Im fairly confident when it comes to electrical stuff, just want clear information before i attempt the conversion to save me having to figure out what to then, lazy i know but meh

so yeah..... GO