Oil Temperature Gauge on OEM display

I seems the oil temperature readout has been removed from the instrument display. I want to add a gauge, just for my peace of mind. Since most other R models have this incorporated in the stock instrument, I presume I can get a stock sender unit that will go in some existing fitting on the engine? Any one know where it is located? Then I just have to find a display that will blend in with the existing instruments. Or just replace everything with the incredible Motogadget stuff!

Thanks for any info.

Robert