Quote: Originally Posted by
ShawJohn 
Unless you add pressure sensors and extra temp sensors you've got no chance.
The Nissan systems don't measure boost at all! They measure airflow and air temp.
Hence why its called a Mass Air Flow system.
EGT also needs extra electronics and AFAIK isn't going to happen with Nissan Consult hardware... It would be easier fitting a new ECU like a GEMS setup to do what you want
There's also ECUTalk for gauges
Which cars don't measure boost? Most cars have a map sensor even if it's not highly weighted by the ecu. It's easy to add one if there isn't. Thermocouples are a little more difficult but any tuner worth paying should know how to do those.
Just about every auto sensor reports in 0-5v, there are daughter boxes on the market now that will collect and log this data. I'm not sure how to build something similar to xmit via usb or similar interface. If all you want to do is display it should be as simple as a wafer board and lcd display.