Connection to the RJ45 socket can be made from any of the Pi Pico pins, provided TX_NEG is followed directly by TX_POS, but the really hacky part is in the hardware. Schematic showing the ...

The Raspberry Pi Pico is a $4 microcontroller ... on your switches to its corresponding pin on the Pico. This is where it helps to have that schematic of your wiring on hand to keep you from ...