Assuming it wasn’t low on refridgerent (all you said was that you evac and recharged it, so I assume it wasn’t low to begin with), it definitely sounds electrical. Is this vehicle auto climate control? I’d bet it is. Follow along with what Craig said above, and use your tech2 to see if there are any DTCs in the ECM or the HVAC control module under the “Body” section. Then use the live data to see what sensor is out of range, it sounds like one of the temp sensors or maybe the sunload if it isn’t the control head itself.
Just don’t throw parts at it. Pressure sensors are not common. It wouldn’t surprise me with a truck that age to have an issue with a slipping shitty compressor clutch that won’t stay engaged.