This is probably the most confusing step. We will wire into the SPI bus originally meant for the stepper drivers. Before we do that, we need to reconfigure the jumpers on the SKR board.
For SKR V1.3: Remove the green jumper and add jumpers between the blue pins (5 pairs) in picture 1 on the non-Z MCU.
For SKR V1.4: Add the 4 blue jumpers in picture 2 on the non-z MCU.
Wire according to third picture. (From E1 driver mount) Make sure pins match up correctly! On some clone MAX31865 boards, SPI pins are ordered differently.
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