Hmmm, mine's a series 1 converted to manual, so I can't really compare. As Ska would say, it's an RS-Four V+S.
Probably the best people to compare notes with are others with S2 RS-Four S's - Wolverine, EGA41T (Andy) and Oxford1327 (Daniel) for a start. Daniel's the one who has it in the hand-brake recess.
Personally, I think that's a handy spot for a turbo timer or similar, but not for a guage - imagine how long it would take to look down, find the gauge behind the steering wheel, re-focus your eyes, check the reading, then look up again and re-focus on the road again. Recipe for disaster...