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.
Well, its good to have an oil pressure sensor, even though they do fail quite often.
IDK why you'd need an oil temp sensor at all to be honest. Oil temp is regulated by the oil cooler and the over-all engine temp. If you wanna know oil temp for some reason, get a pyrometer and use it to tap sections of the oil system and motor to get an accurate reading, thats what I do.