You can sniff either trigger angles or MAP values.
Analog chart tab in java console is a very, very plain oscilloscope build into rusEfi firmware.
Analog chart always displays the signal for a duration of one complete engine cycle.
Currently analog chart can display one of these two things
1) trigger signal shape. the value consists of the trigger signal index and fall/rise type of the event
2) MAP sensor signal
Greed line is a border of engine cycle. Please note that the angle within current engine cycle is displayed in the bottom left corner - the angle is from 0 to 720 in case of a four stroke engine.
Red line is just absolute time scale. One line per second? Per 100ms? Something like that. TODO.