If ever you have to replace the oil pump of a Polo/Jetta FSI Engine then I have some help for you. There are no proper marks to replace the pump. You have to make your own marks on the old pump before you remove the pump. Make sure the engine is not tdc and the cambelt alignment is correct, fortunately, there are proper cambelt marks to work on. Mark your old pump where you want, but just on the gear of the balancing shafts. The other gear is for the oil pump. If you do not know how to mark it, I have a picture attached to show you. 
You will see the red arrow pointing to a hole which I have colored blue, there is a mark on the balancing gear pulley (see yellow arrow) make sure the gear and the blue hole align as per the picture and fit the pump accordingly. This oil pump also runs balancing weights. Hope this helps