I'm not sure if we are agreeing or not

If it's on a gasoline scale where 14.7 is stoich or lambda 1.0 and it's ran on-

E85 with 9.8 stoich

Or C14 at 15.07 stoich

At -actual- stoich, the gauge will still read 14.7-1 because that's what it's programmed to read at 1.0 lambda no matter what fuel it's running.

So take any fuel and tune it to known gasoline numbers and it tunes the same as gasoline whether it is correlating with that fuels actual stoich number or not.

10-1 on a gasoline scale is .68 lambda. (14.7x.68). So on C14 that would be 15.07 x.68, or 10.24-1



Looking at it another way, what is your target lambda? If you target .87 lambda WOT on gasoline that's 12.8-1 air/fuel on a gas scale gauge.

So any fuel you run if you wanted to target .87 lambda and your wideband is on a gasoline scale, you would tune it to 12.8-1 on that gauge.

If you change the scaling of a wideband you're just changing what number it reports for the same lambda value. (so sometimes easier to just look at it in terms of lambda instead of air fuel ratio)