The clock even keeps good time, I'm well chuffed with it.
For later reference:
White/Black - Earth
Green - Dimming
Green/Red - Connect to accessories on ignition switch
Blue/Yellow - Constant power
I just connected them all in with the radio connector as it was handy.
On another note - I have my indicators working again !
After taking the dash top off and learning all about ae92 wiring ( thanks again for the wiring diagrams parrot :) ) I found out all the wires were intact... I had blown a couple of bulbs in the instrument cluster taking it out, with the battery still connected, a few times so I figured since everything else was working there was only one thing left to be causing the issue. Something, not a bulb, must have shorted or something the last time I took the cluster out with the battery connected. I had already tried replacing the usual suspects and that didn't help so it was time to check the less likely suspects. This was nothing even remotely similar to anything I've encounted before, but I'm not in the habit of continually blowing things because I haven't disconnected the battery first. But since I had spent half a day with the laptop open showing the wiring diagram pdf confirming all the wiring was intact it had to be something in between all the wires. It was the hazard light switch. Today I went to the wreckers for a replacement and 15 min later I was indicating again. Funny thing is, after driving for a couple of weeks it was today for the first time that someone honked at me for not indicating.
tl;dr it was the hazard light switch.