Apologies, I haven't been on the forum recently. However, a few photos are attached The first photo shows the dimmer switch knob under the dash and easily found whilst driving and strapped in. I may put a rubber or plastic knob on it to make it easier with gloves but as I rarely wear them I probably won't get around to it. The dimmer switch sits on the top side of the aluminium plate that is under the dash and contains the large rubber grommet that gives access to the diagnostic / management plug. It's not visible as it hides behind the radius of the bottom edge of the dash second photo shows normal full illumination and the reflection in the side screen, whilst the third shows the lighting dimmed to such that the digits renaming readable and there is effectively no reflections in the side screens. The last photo shows them dimmed such that just the needles show. They can of course be dimmed to no light at all as for wiring, it's simple. Cut the red and white feed wire into the tacho and Speedo and from the loom end connect them together along with the feed into the dimmer. I do this with solder and heat shrink, tidy and way more reliable than connectors. Pick the earth up on the side of the main light switch and solder the dimmer earth onto the small spade end that connects it. Then cut the feed into the other three instruments, seal the loom ends with a double layer of heat shrink to terminat and then bridge the feed wire from the dimmer into each of the instrument plugs. If I could have got a wiring diagram and find the feed at the fuse or relay box I'd have done it that way, but I couldn't find the wire without major dismantling that didn't warrant the effort in my view. hope this helps