I can monitor both at the same time, but the LTFTs are more important here. I also monitor knock, which never happens as far as I've seen, since I run conservative timing. Scan gauges are awesome, you can change what you are monitoring off the OBD buss on the fly and log two variables at a time. Anybody who mods their car this extensively should be running them. Anyway, if I am in tuning mode, I use the Diablosport to log all the important things at the same time. Then I can make graphs or play it back on the computer and send the data to my SCT tuner.
2012 Focus Titanium
2002 Camaro SS, waiting for new turbo...
2005 Neon SRT-4, Big wheel stage 3, E85