The 2008 thru 2012 models of the Escape have a 3 wire pressure sensor...you cannot merely jump it. One lead is 12v, one is ground, the other varies in voltages according to pressure that reads back to the ECM. Changing the sensor out with a known good one is the best way to check.There should only be two. If you have a connector with more than two connectors it is the wrong switch.
Remove the connector and connect the two in the connector. Usually a paper clip does the job. Just keep the wire or paper clip away from a ground source because that will ground out the circuit.
Some times adding refrigerant on a static system does not put enough pressure into the system to trip the switch. I have worked on vehicles that needed the electrical jump and others that do not.