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MPGuino is the better choice
look over the list of Parameter IDs PIDs in Ultra gauge and Scangauge to see if
"Air Fuel ratio " is on the list or
"Current lambda "
real scan tools have these PIDs but Scangauge is not a real scan tool and Ultragauge is not a whole lot better although it is the better of the two .
MPGuino will show you real time FE in MPG and Gallons per hour
when your system changes to "lean Burn" you will see your real time FE improve , so even though you do not know actual AFR you can see when the improvement happens and when it stops .
so
MPGuino is your best choice imho
or
make your own instrument cluster using this software with a small notebook or laptop - this software does have an AFR PID
and it does cost less than scangauge, you will need your own laptop or notebook
OBD-2 Scan Tool Browser Virtual Dash Board screen shot
OBD-2 Vehicle Explorer Scan Tool Browser
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