2nd air gauge not working

[allan82782]

I have an 08 prostar with a cummins isx and I been having issues with my air dryer the problems are my primary and secondary air gauges rises to 150 psi then the emergency blow off valve sets off. I replaced the governor and still no luck so recently I replace the entire air dry and it seem to work for a week or so then ride back to the same issue again I'm starting to think it is my air compressor but before I spend that kind of money I want another opinions.