15 min job, piece of p!ss, and looks coool 
lol if your on about fitting a boost guage you must be wrong? i rang up awesome for a quote and they said around the £400 with labourmark as it takes upto 3hours to fit correctly as they have had problems later on with installs going wrong.
they said something about removing interior parts and routing wires so they dont get damaged or worn down plus placing it in the correct place??
i could be wrong as i have not done it personaly.