air dyer purging every 10s

I'm not sure how it worked before, but I just replaced the line from compressor to dryer BC it was clogged with "carbon". Builds air great now, but now once the gauges show 120psi the dryer purges and the gauges drop 5-10 psi and it builds air bk up and purges again. Constantly. What could cause this? Maybe the valve in the bottom of dryer? Governor? I just spent enough on the new line that I don't want start throwing $ at it. Oh, and the line I replaced went from braided to a coupling that turned into regular air line. I replaced with one piece braided line. I don't think that would "hurt" anything though..

 

Just put a governor on it. Problem still remains. The governor is mounted on the dryer itself which is mounted to the tank. Must be new design. Now I'm wondering if I put the fitting in the right place. There's only one fitting that runs to the compressor. And looking at the dryer, I can't see how just the bottom valve assembly would come out to replace it

 

Just replaced the unloader in compressor and the purge valve in dryer. Problem is still there
Running out of ideas. I'll check for leaks in that line

 

Detroit s60. O7 freightliner