My FAST O2 meter has a 5v output that I ran into the mefi harness. Unfortunately, can't recall what pin. Sent you a few files. Some 4a and 4b. Use the right .adx file to view and they should open right up in TunerPro.
click here for some video
The lake won't fill up from this event at all. So far, only 4" rise as of this morning. We're 47' below full pool. It will take a massive rain event over several days to have any dramatic impact, but we'll take what we can get!