Just tested another release of UiFlow (version 2.3.3) for the Tab5... Unfortunately, I am seeing the same results that I saw with Version 2.3.2... -16Kpa without any air tubes connected to the M5Stack Air Tube sensor... Along with the i2c driver install error...
Hopefully M5Stack Team is getting close to resolving the issue... I was planning to use the Tab5 project I was working on for the M5stack Innovation contest but it looks like that will not happen due to the issues I am running into with finding an air tube sensor that will accurately work with the Tab5... Oh well... Hopefully the M5stack team will release an upgraded Air Tube sensor soon that will easily work with the Tab5... Until then, I will keep searching for a solution....