Borrowed the pic above to ask a question. The 5 wires that go into the back of the dimmer/adjuster switch. The adjuster had 2 connections on the back and the dimmer has 3 connections. Anyone know what the 3 wires would be in terms of power,earth etc?

The +ve feed (green wire) comes from the same light switch output as the numberplate lights. The fuse is also shared (F36), so if you lose all the instrument lighting, check the number plate lights.

The brown wire is the earth and the green/blue wire is the output (PWM) to all the instrument lights.