Idk about the high side switch, but I'm assuming that you got it figured out since your signature says the ac is fixed lol.

What oil did you end up using? I have to convert my truck to R134 and am thinking about getting a new pump, but I'm worried about getting the wrong oil or mixing wrong oils.

 

I ended up finding that Motorcraft AC oil on amazon or ebay. I forget which one. It was through a dealership that was selling online so i'm sure you can find it at your local dealership. I think my Ford manual said it needed PAG 500, but I can't completely remember.

My AC mechanic said I could have just used that AC oil (PAG 150) from autozone or wherever you can find it.

I didn't get a high side switch. Instead, i was going to install an aux electric pusher fan on the condenser to make sure the idling AC high-side pressure isn't too great, but I couldn't find a fan that was thin enough to fit between the condenser and grill on my van. However I did install a new fan clutch so maybe I have enough air movement with just that, idk because I don't have the guages to check.