Thanks for the input all.
As ever with tech questions, the answer is the one that is most correct or in some cases least wrong.
Have read that the oil pressure trigger auto function is an "option" right up there along side wings and loo seats. Our version has the cup holders, and the 12 CD changer with boom box so does have the oil pressure thing, (complicated technical terminology).
Well at least until the tech pilot says otherwise.
cheers
FC