You don't by chance have a part number for the pressure switch do you?

Thanks,

 

921361FA0A It is a Nissan part

 

my 04 sedan compressor went, i got one off an 03 sedan and the garage is telling me there is no pressure switch on the one i got, and it is the wrong part. I thought they were interchangeable? is my garage just trying to get me to buy a new one from them or are they correct?

 

Where is the relay for the air conditioner located