The oil pressure sensor on an astra gte is located directly behind the oil cooler adaptor plate.
All cars have an oil pressure sensor fitted which is linked to the red oil pressure light that is on your dash probably located somewhere near the battery light. So, yes, I think you could safely say that it does.
The Oil Pressure sensor for the Astra is where Meady said it was,
All cars have an oil pressure Switch, some have a sensor,
The switch (as on the Nova) is either in the on or off position, (Red warning light on or off in the instrument panel)
the Sensor senses the pressure and goes up and down in gradients (ie,Digi Dash readout).