J.C. Whitney AFR meter

[Orin]

> Basically.  The LM3914 uses 1.2v as the reference (full scale), I assume the
> Whitney meter does the same.  I believe the EGO sensor output is basically
> meaningless above about 0.9v.

LM3914 doesn't need to do 0 to 1.2V, it's easy enough to
set scale and limits using a couple of resistors per LM3914.
I use two LM3914s and set the first to do 0 to 0.5 V and the
second 0.5 to 1V, using just one of the 1.2V references.

Orin.
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