I got all the bits needed to fit the boost gauge so i did it today. Bit of indescision on what wires to cut into so i did a quick search on here and found that the grey&yellow is switch live and brown is earth (cig lighter) so i connected it like that and it works great!.
Here is a pic of it fitted:
I was going to try and colour code the panel but i actually think it looks good black. Ties in with the other black bits in the console.
Anyway what you lot think?