* Refrigerant pressure sensor: This is a more general term and applies to sensors measuring pressure in any refrigeration system, not just automotive AC.
* AC pressure switch (sometimes): While a pressure *switch* simply turns something on or off at a certain pressure, some pressure *transducers* also incorporate switching capabilities. So while not exactly the same, it might be used colloquially. It's important to distinguish a transducer (measures and outputs a signal) from a switch (simply opens or closes a circuit).
* Manifold pressure sensor (in some contexts): This term is used more often in the context of AC service equipment that measures pressure on a manifold gauge set. It's not usually applied to the sensor in the car itself.
In short, "refrigerant pressure sensor" is probably the closest commonly used alternative. The best term to use depends on the context.
