The aux drive is what rotates the distributor and also the drive for the oil pump

The aux wheel has an arrow like the cam wheels do when you look closely at the pointer arrow on the aux wheel it will line up with a raised circle on the cover behind wheel

Once this and everything else is lined up make sure the rotor arm in dizzy points to the notch cutout in the body of the dizzy if not twist dizzy slightly with cap off till it does
Rotor arm should be on no1 when fitting cap on then

Hope this clears it up a little