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Fire up the car and turn on the AC. Your car's idle should jump up a bit. Turn off the AC and the car. Your compressor clutch won't engage because there isn't any pressure in the system. The pulley will turn, but the forward end of the compressor won't. Don't worry, this is normal. It does this to protect itself.

Remove the connector from the pressure switch on the H/L lines. Jumper the connections on the harness side with a piece of wire. Start the car again. Go to the engine bay and look at the end of the compressor. It should be turning now. If it isn't, check your connector again, check the jumper. If that isn't it, you will need to diagnose the relay.

If you don't have a gauge manifold set and vacuum pump, take it to a service shop and have them evacuate the system, check for sustained vacuum and refill with refrigerant. If you didn't add oil to the compressor, tell them. Also, tell them you updated the AC system from a newer model. Give them the year it is from so they know how much oil and refrigerant to add.

Good luck!