If you want a good guage display you can get a blitz R-VIT.
Will show basics- speed, water temp, rpm.. no boost unfortunatley, but will also show ignition timing, injector duty, 02 sensor, with peak levels and audible/visual warning limits, data recording and will decode any errors from the ecu to tell you what they are. Oh and its easy as to install- just plug it into your service/consult plug, no wiring necessary!!
But guessing you're after afr/boost readings, which this doesnt do (at least not on my car)