I have a 2011 Altima 2.5. I want to test the A/C pressure switch. I saw on line that I can do this by using a paperclip to jump the connection. Is this true and if so, I see 3 wires at the connection (Pink,red and white) which wires will I use to jump the connection and see if that triggers the A/C clutch?

There's no "pressure switch" on an '11 Altima, and "jumping out" the refrigerant pressure sensor in any way will probably destroy it (it's a Hall Effect type internally). It can be checked with a voltmeter, but the right way is with a scanner. Most decent OBD-II scanners can pick it up, the info is part of the ECM data stream. When they die they usually flatline at 0V. If you see any sort of reading above 0V, chances are you have a low pressure condition caused by a leak or gradual seepage.