Sorry I’ve been wiring a new club layout too and haven’t had time to slap a diagram for exactly what your doing so here’s one I’ve had.
DISCLAIMER: this shows 360W going through the TIU this is NOT recommended as the TIU traces can only handle 10A. This may also have some added features that you simply don’t need and just ignore them. But it’ll be the same set up take one handle of each ZW and run it through the TIU.
Set the variable channels to fixed to allow power to flow through the TIU. If you plan to use the power master feature of the ZW-C then I believe you will need to hook up the common wire from your command base to the ZW-C and the output of the TIU. I believe the TIU will kill the TMCC signal. This will allow you to run any type of engine on any given track at anytime without having to plug and unplug items. Please also know if fixed 1 on the TIU isn’t always powered then you need to pier the TIU via the AUX power port
