Get the HKS Camp 2 mate well worth it lol
I dont know if you can change the PSI - BAR etc on it yet i not looked into it as already started on next mod
the bonus witht he HKS Camp 2 is it takes most of the readings from the OBD2 and then you can add other sensors via the IF unit boost, oil pressure, oil temp, EGT, and many more, if you can pick up one second hand then you will be laughing.
Have a chat with the guys at http://www.mazdarotaryparts.co.uk/
they did a cracking service for me and competative
Rabs