The LM-2 is capable of logging AFR and RPM, as well as four other analog inputs.
If I had a MAP sensor and a TPS I could see a graph of my AFR, the RPM what the vacuum was, and the relative throttle position.
Here's a typical graph (not mine):
With a graph like this of a run, I'd be able to go to any point in the run adn see what AFR I was getting, what the RPM was vs the throttle position.
This is helpful because, returning home from a run, it's hard to remember what you were doing at any particular point.
My objective is to have a normal mixture at both idle and cruise, but a richer mixture at large throttle openings. Right now I'm almost there, but have my cruising mixture a bit rich. Probably just need to drop the needle.
This MAP and TP sensor stuff is just me playing. I mean, I'm but a poor pensioner now with nothing to do...