I can display the boost gauge in PSI on my phone.
No wiring needed just an OBD2 bluetooth device and the right software.
you must buy this first : Bluetooth OBDII OBD2 Diagnostic Scanner, Scan tool: Amazon.co.uk: Electronics
and then use an app on your phone, if you use android, the best app is called Torque.
Why does the Horsepower gauge only go up to 110?