[Oil pressure switch removing on T31 dci]

Hiya everyone, can anyone please give me any tips or instructions as to how to remove the oil pressure switch on T31 dci , it's almost inaccessible I'am guessing at it being 22mm deep drive socket . but boy they have won the prize for hide the switch comp. Help please no much skin left on Knuckles.

[Oil pressure switch]

Hiya all I am new to this site I live in Exeter Devon in the UK . 

I really hope someone maybe able to tell/show me the location of the oil pressure switch on a 2008 T31 2lt DCI X trail I need to do a pressure test and I am pulling the few remaining hairs out of my head looking for it Any help greatly appreciated.