The switch will have a hex on the base of it to put a wrench on. The line will as well, so what they want you to do is use 2 wrenches..one to hold the line steady so that you dont bend it and the other to undo the switch.
POWER STEERING SYSTEM FILLING
See wiring diagram for power steering pressure switch and steering column:---
In the first diagram on left side see" N96 is power steering pressure switch wiring.