I'm not sure where a better place for it would be. The gauge I want front and center on my instrument cluster is the tach. Fortunately it's that way from the factory. When I had my RX-7, I mounted the boost gauge to the dashboard, on the right side of the instrument binnacle - but there is no room for a gauge there in a Boxster.
Not sure why Jim is being so insulting - bad day? There are things people on this board have done to their cars that I would consider to be pretty ricey but ... to each their own. If having the gauge there suits your needs, more power to you. You can always move it later!