Radek
Radek
PA2 and PA3 There are RX and TX pins on the TFT connector.
I won't help you. I don't use Raspberry or Klipper.
Send config and photo involved
Did you enable configuration.h? #define DGUS_LCD_UI_MKS Which serial port did you connect the display to? You can't see it from your photos. In the configuration_adv.h file, add a line with...
If you do not define a serial port manually, serial port 3 will be used 
What port number did you add?
Attention WIFI connector has only 3.3V power supply.
Your involvement is wrong. The connection of the adapter does not correspond to the connection of the WiFi connector.
The adapter will probably be compatible with the AUX1 connector on the SKR V1.3, but you have SKRV 1.4 and the tan does not have an AUX1 connector but WiFi....
 