Alright. Just came across this in the installation manual. It appeared next a giant "Warning" sign.
Rethreading of the bottom bracket shell and re-facing the bottom bracket shell
surface has to be done before installation. Rethreading avoids bending stress when
mounting the ergomo pro sensor. Rethreading ensures that the threads are optimally
aligned so avoiding bending stress. This procedure leads to accurate wattage numbers.
Non-compliance with this instruction invalidates the warranty.
The width of the bb part of the bicycle frame needs to be 68.0 mm ± 0.2 mm.
From what I understand, it does come with a BB tool to help with installation. I'll look into getting the other parts. I should find some people who have installed an ergomo previously, and see just how important the warning I printed above is.