Hi not sure if this helps but i just bought a scangauge 2 it works from the port under the steering wheel works on all cars that have it, obd2 or something like that and it can display 4 readings from the ecu aswell such as boost in psi though, rpm, speed, water /air temp/ injec etc also has some funky trip computer built in to show mpg/avg speed top speed, tank use etc..
and it find fault codes and clears them..