You can get this with the sender much cheaper(relatively) for about £500 if its PART NUMBER: 197118-£498 Scuderia parts or £600 if its part 800600 number f suppliers- the lowest i found was £555 for 800600.
The sender unit is external to the bearing and held in place by 6 rivets/pozi looking at pictures of the part- it maybe you cant get the sender unit separately to replace on the bearing or vice versa.
What i do know at these prices I would be Googling everything I could !