Slew

I am hoping someone here can tell me the correct way to remove the Water Pressure Switch from a Pentair MasterTemp 250. Does it screw off or am I supposed to pry it off? If it screws off then I don't seem to have enough room to rotate it without hitting the side panel. This is the first time I have closed my pool with this new heater and I don't really want to force it off. I would appreciate any advice. Thanks.