Oh ok I must’ve missed something along the line, no problem.
When you have the ZW-L you will no longer need TPC’s. You need a command base and no more than 1 command base wether that’s a Legacy 990 Cab-2 set, a Legacy Cab-1L set or a standard TMCC command set. Only 1 is required
good thing to bring up DCS to use the powermaster features of the ZW-L you have to send your command wire to its binding post. (All U terminals on the ZW-L are common with each other) but if you run the legacy signal through the TIU I believe it will die. So you would have to run a wire to the transformer AB then a wire to your layout common. But I haven’t tried that so I don’t know if that would then cause DCS problems. You could I know for sure run the TIU in passive mode and have no issues. Hopefully someone smarter than me on that front will pop in.
I would like to point out again if your just needing 4 outputs 1 ZW-L will do the job. 620W max output should surely handle most anything you though at it. Only down side is to see the volt and amp meters you have to go hold either the B or C handle to see that outputs information. Then again nothing like seeing 2 ZW-L’s side by side all lit up on a layout 😉