Profile: Michael Rought

I have a 2009 Thomas Bus being converted to a skoolie. It has a Mercedes Benz MBE926 engine installed, w a 9 pin J1939 diagnostic port.

I am not getting any boost information from the app. It is receiving some form of info as it doesn't have a greyed out N/A under the gauge. It always reads either "0" or "-20" (the lowest range I set to it incase it was wanting to show vacuum).

Going to the repair menu on the app also shows boost always at zero.

Is this a bug w the app, an interface issue with the MBE's ECM or operator error?