2002 4.0 sohc

Howdy folks, Trouble with the AC system in my 2002 Ranger XLT w/ 4.0L SOHC. Pictures of the gauges are attached, don't know if I did that right. When I turn the cabin switch to "AC" I get 13V at the relay. Clutch engages and pressure spikes for about half a second, then it goes off again...

Hi everyone, I’m about to swap my 02 4.0 with a 06 4.0. I’ve read I’ll need to use the intake and injectors off the 02, what is the difference? I also heard the intake will need to be from the 02 even though by looking at them they look the same. Can someone give me some advise what actually...