Apparatus for measuring a hydraulic pressure of a hydraulic component, comprising: a pressure sensor module; and a mounting plate, that is either an outer contour of the hydraulic component or is connectable with the hydraulic component in a substance-to-substance, form-locking and/or force-locking manner, wherein the pressure sensor module comprises a housing, at least one pressure sensor for determining the pressure of a fluid, at least one fluid connector for hydraulic connection of the hydraulic component, at least one electrical connector comprising a conductive mating surface; the mounting plate has a basic area and at least one electrical connecting pin, whereby the connecting pin is spring loaded and essentially perpendicularto the basic area of the mounting plate, the first end of the connecting pin is oriented towards the basic area, the second end of the connecting pin is oriented away from the basic area, and the second end of the connecting pin is pressed, by means of an elastic element, away from the basic area and towards the electrical connector when the mounting plate and the pressure sensor module are assembled; and the pressure sensor, the fluid connector, and the electrical connector are arranged within the housing; the mounting plate is connectable with the pressure sensor module in a force-locking manner; and when the mounting plate and the pressure sensor module are assembled, the electrical connecting pin is connected with the electrical connector via its second end, characterized in that the pressure sensor module and the mounting plate comprise a mixture of more than two apertures and guiding elements, wherein the guiding elements from the pressure sensor module fit the apertures of the mounting plate and the guiding elements of the mounting plate fit the apertures of the pressure sensor module, wherein the apertures and guiding elements are arranged to form a kind of key that only fits to a distinct combination of several apertures and guiding elements. a pressure sensor module; and a mounting plate, that is either an outer contour of the hydraulic component or is connectable with the hydraulic component in a substance-to-substance, form-locking and/or force-locking manner, wherein the pressure sensor module comprises a housing, at least one pressure sensor for determining the pressure of a fluid, at least one fluid connector for hydraulic connection of the hydraulic component, at least one electrical connector comprising a conductive mating surface; a housing, at least one pressure sensor for determining the pressure of a fluid, at least one fluid connector for hydraulic connection of the hydraulic component, at least one electrical connector comprising a conductive mating surface; the mounting plate has a basic area and at least one electrical connecting pin, whereby the connecting pin is spring loaded and essentially perpendicularto the basic area of the mounting plate, the first end of the connecting pin is oriented towards the basic area, the second end of the connecting pin is oriented away from the basic area, and the second end of the connecting pin is pressed, by means of an elastic element, away from the basic area and towards the electrical connector when the mounting plate and the pressure sensor module are assembled; and is spring loaded and essentially perpendicularto the basic area of the mounting plate, the first end of the connecting pin is oriented towards the basic area, the second end of the connecting pin is oriented away from the basic area, and the second end of the connecting pin is pressed, by means of an elastic element, away from the basic area and towards the electrical connector when the mounting plate and the pressure sensor module are assembled; and the pressure sensor, the fluid connector, and the electrical connector are arranged within the housing; the mounting plate is connectable with the pressure sensor module in a force-locking manner; and when the mounting plate and the pressure sensor module are assembled, the electrical connecting pin is connected with the electrical connector via its second end, characterized in that the pressure sensor module and the mounting plate comprise a mixture of more than two apertures and guiding elements, wherein the guiding elements from the pressure sensor module fit the apertures of the mounting plate and the guiding elements of the mounting plate fit the apertures of the pressure sensor module, wherein the apertures and guiding elements are arranged to form a kind of key that only fits to a distinct combination of several apertures and guiding elements.