Hi just did mine a few weeks ago ...someone posted this image for me .....
it is 7.....VCC and GND are always common ( or can be) AFAIK
it is important to determine the type of magnets you have as it seems the Seller of these Boards is Shipping ANY magnet they have in stock , not the diametrically magnetised ones needed (best) as Barra just found out above and Penzija before that.
I should of also mentioned Surrrise that you should connect MISO (MMjoy SR-Data) from the TLE5010 boards to another Digital Pin ( any one you have free) as the TLE MISO (common) will interfere with the MISO data from the Handle PCB which has 3x 4021 Shift registers on it.
FYI I found I lost the Handle buttons when I did this before knowing the above information.....
Thank you for the information but it is not im my case - my joystick will only have two axes and two/three buttons so one ProMicro will full handle it