You have to connect the pypilot motor controller to UART0 using the Raspberry pin header.
If you use UART0 for pypilot you can not use a MAIANA transponder or a dAISy HAT. If you need UART0 for one of these devices you can also use UART2 in Raspberry 4 (GPIO 0 and GPIO 1) or UART1 in Raspberry 5 (GPIO 0 and GPIO 1) for your pypilot controller.
If you use UART0 for pypilot you can not use a MAIANA transponder or a dAISy HAT. If you need UART0 for one of these devices you can also use UART2 in Raspberry 4 (GPIO 0 and GPIO 1) or UART1 in Raspberry 5 (GPIO 0 and GPIO 1) for your pypilot controller.