I just went to the techme page to check out the system and it looks pretty cool. Let me see if I understand right… provided I have a gland to run the harness through I could add a couple of solid state cells to my unit and plug a four pin shearwater cable in and be good to go? If that’s the case it seems like an amazing tool for double checking or even verifying the oxygen calibration of galvanic cells (I don’t think I could switch all the way because my solenoid wouldn’t run right with the new system and it requires a five pin anyway).
Do not forget that you will need one of the "solid boxes" that are also listed on the TecMe website - you need power for the cells and DAC converter (4 pin is an analog connection). That is why one needs that extra cabling gland if I understand correctly.
But other than that, its seems like as close to "plug & play" as it gets at the moment.