Haven't heard of them before but looks like they have been around a while as I found a video from 2011

Are they similar to the ones you put in awhile back?

Sort of, they also have a strip to stick on the outside of the tank, but the SeeLevel strips look a little more sophisticated - https://www.loveyourrv.com/seelevel-ii-review/
They can run multiple sensor strips on a 2 wire digital bus line, I just used the OEM wires. But maybe the newer generation Tech Edge is different than this old video, I can't seem to find an up to date video about them.

alrighty, thanks.