I built a mini-itx computer with a DC-DC power supply. The software is Dashcommand by Palmer Engineering, it gets info from the OBD2 port via usb. Boost and Oil pressure data come from PLX sensor modules, usb as well. Gauges are customizable and programmable so you can pretty much make a gauge for whatever you want... providing there is a signal from the ECU or a supported sensor module for it. Check my journal for more pics, page 9