If you're using the REV Robotics Analog Pressure Sensor, their datasheet has an equation to convert the voltage measured by the analog channel to the pressure measured by the sensor.
Datasheet:
http://www.revrobotics.com/wp-content/uploads/2015/11/REV-11-1107-DS-00.pdf
I don't have access to an FRC version of LabVIEW today, but I made a quick subVI that calculates the pressure from a given voltage (The VI is just the equation in the datasheet).
You should be able to use the AI Open.vi in begin to name the reference, then use the AI Get Raw Voltage.vi in teleop (or autonomous) and wire that value right to the subVI to get the pressure.
Hope this helps!