does anyone know where th A/C high pressure switch is located?? is it the one on this picture?

I've scoured this site and Google to no avail on the locations of the Oil Pressure Sending Unit(s) / Oil Pressure Sensor(s) and the Oil Pressure Switch for a 2004 V8. Please help, as I am unable to find them. :confused: Thank you for your assistance and time. :) Robert~

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I'm having a strange sound coming from the turbo on my remapped 2005 2.5TDI, I've logged the turbo pressure which seems high, can anyone confirm that the boost presure is too high or too low? As Follows - Required Boost Actual Boost 1030.2...