Y cable into both shifters and Junc A. Battery into Left shifter, RD into Right shifter.
Great!
Are all di2 wires the same just different lengths?
Assuming you don't buy the original Di2 cables from so old 10spd build.
@PhilDAS started
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Y cable into both shifters and Junc A.
Battery into Left shifter, RD into Right shifter.