I THINK the permanent live and the switched live MAY need swapping over. I have a 92J reg Gsi and when I was hooking up my headunit to the ISO connector I had to swap these over otherwise the headunit would lose it's memory each time it was switched off. I could be different for later ones or a peculiarity of the Alpine units I have fitted, I dunno. Ask Andy K, he'll know for sure. Other than that it's just a case of plugging it in.
Chameleon.