The PS1201C01 not Compatible with the W8600
The PS1201C01 power supply kit does not come a daugther car for the connection of the W8600 remote indicator. The PS1201C01 is for a power box without the terminal strip as in photo below on left. If your power box has a terminal strip for the W8600, then this power supply does not have the connection for that terminal strip.
If your powerbox has an unused terminal strip because you are not using the W8600, then you can use this power supply and internally not connect the unused terminal strip.
The PS1202C00 power supply provides a connection for the W8600. The PS1202C00 power supply was made for a power box that has the terminal strip.
Photo shows power box with and without the terminal strip.