You’ll probably need the 13-21-29 chainrings (26-42-58 equivalent) with the conical spacers (they act as shift ramps) from da Vinci to make it work if you don’t have them already. Todd sells his da Vinci tandems with Di2 and has for a few years now, so a quick call or e-mail to him might be advised in order to save some trial and error like which front derailleur mount to use.
Last edited by Joint Venture; 06-08-19 at 01:40 PM.