I got it cheap of coarse

) and its gonna be a little project car mi think. When I say it drives fine I mean its not clattering and clonking all over the
shop. No leaks from or around the turbo and plenty of oil in the engine, can only think its just the turbo. No smoke comes from oil cap on top of engine when removed (whilst running) and with it starting very well (compression) I am ruling out for now piston rings - also water looks fine.
Just didn't think oil light would come on if just the turbo blown, as thought oil would still be circulating and pressure in main system, or is there an oil pressure sensor on or near the turbo?