Q: AC Compressor Runs All the Time With No cooling in Cab

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2006 Dodge Ram3500 5.9l Cummins Diesel Laramie 151,000mi, Replaced 2 weeks ago, Condenser, Evaporator, Receiver/Dryer, Liquid Line (Orifice Tube). Added 7.1 ounces of PAG Oil/OEM Spec to to (Accumulator, Condenser, Evaporator and Compressor) system. I removed the dash and replaced the Evaporator and Heater Core as preventive measure. Inspected all HVAC doors and servo-motors all SAT. Pulled vacuum for 2 hours with no leaks. Added 30 ounces of R134a freon per OEM spec. and cab temperature was at 47f. Now cooling failed again and measured no pressure in system with compressor clutch engaged spinning when AC switch is on? There is only one pressure switch with this design. Compressor replaced June of 2015 <1yr old (Remanufactured from Chrysler/Dodge). Suspect pressure switch at fault and or compressor fault?

My car has 999999 miles.
My car has an automatic transmission.

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