How to pair Vive wands and lighhouses with Pimax 5k+?

The Pimax headset works fine by itself; when I put it on it displays the SteamVR starting area and tracks head movement. PiTool does not recognize any of my vive hardware though (all the device symbols are grey/disconnected.) I cannot find someplace inside Pitool to initiate a pairing.

SteamVR also doesn't seem to let me pair the wands to the new headset, but will let me continue to use them if I'm using the vive headset. That is, all the hardware is working separately.

Please help? How do I pair my existing Vive equipment to my new headset?