Marc, is there any issue with the probe and the TT1 plungers both moving at the same time throwing off the probe measurement, or is the spring in the TT1 stiff enough that it doesn't move a significant amount by the time the probe compresses enough to trigger?
I'd thought about a splitter box - I found that you can't just leave the probe plugged in and sitting beside the machine without getting a "remove the probe from the spindle" message popping up.
I'd hoped it might be possible to just wire a couple of receptacles in parallel and leave the TT1 and probe both plugged in all the time. I'm always concerned that those little pins are going to get bent as I fiddle trying to get the plug aligned. Centroid should consider doing a cable that works in either device so you can leave the cable plugged into the control all the time, and just change it at the TT1 or probe instead (if that is possible).
I'll consider your splitter at some time when I'm flush with cash, but this has been a year of a LOT of unexpected tool expense (like a new Miller Syncrowave 250 last month when my old Miller Gold Star died in the middle of a project) so swapping the TT1 and probe is something I can live with for now.
cheers,
Michael