I've decided to buy some guages for my turbo S2000, but I cannot decide which ones to get. Can someone explain to me the different gauges: boost, temp, pressure, egt, and the relevence they have on how my car is running.

 

I'd say EGT for sure. This tells you whether your A/F mixture is tuned properly. Other than that, pick some others.

 

if you want an easy install job and don't mind spending a bit more cash, go with electronic gauges instead of mechanical...

but i'd have to say that the new Blitz BL gauges (mine!) are tightttttttttttttttttttttt

 

Yeah I was really thinking about the Blitz ID series. Cheap and pretty nice looking.

 

This thread should give you some ideas of what is possible. Supplier of these digital gauges: http://www.intellitronix.com/streetdig2.html