well think about it.
in a good tune, youd want your car to be at about 11.5 or 12:1 on full throttle.
and if it got to like 12.5:1 or 13:1 which is lean on full throttle, you'd want to be warned so you can back off right?
so you would tune it to show rich at anything bellow 11:1 and lean at anything above 12.5:1
but like I said before, at idle and cruise revs where you are in closed loop, below 4000rpm or whatever it is, the mixture is ALWAYS going to be over 14:1.
so it will be lit up like a xmas tree to show lean and buzzing it's arse off.
now... about this steak we discussed.