If you do a shearch in google for "OBA" or "on board air" there are lots of companies (mainly in the US) who do kits. Kilby is on of the biggest and most useful websites there.
they do a conversion on the sanden type (rotaty, like the RR A/C compressors) where a grease nipple (or Zirk fitting as they call them) is fitted about half way down the body, and a grease gun can pump a bit in every now and again to lubricate.
also, some people just put a pre-oiler in the air inlet, and an oil catcher on the outlet, sometimes with a connection pipe so it's self filling (although some of the oil does work its way down the pipes... OK for air tools as it'll lubruicate them too, but not too good for rubber tyres)
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