You can drill and tap the original one or get one from JHP Coventry,
The sensor for the oil temp is the same as the water temp sensor
not the temp/gauge sensor though.
The oil pressure sensor is fitted to the same take off point as the normal switch but is on a banjo fitting and pipe.
It fits to the frame tube but i have fitted it on the lower tube as
another part is in the way in its correct location.
brian.