I'm wondering about adding a fuel air meter to give a broad sweep of feedback given carburetor, gas, load, crossover, etc changes that may or may not be leaving expensive rich or damaging lean running conditions.

Why is this gauge not very common? Amazon cheap setups start at $100, and better rated stuff seems to be about $200

Thoughts?
Thanks

WAlly,
Interesting to know mixture was all over the place. Did you get any usable/actionable information from the O2 meter before going to fuel injection?

Yeah, my big take away was the the engine seemed not to care much about ratio. It would go down the the 11's on a floor it and cold starts. Cruise was 13 to 15's. Ours will lean stumble somewhere between 16 to 16.5. We don't need to keep a catalytic converter happy so there is no need to be at 14.7 all the time. We can tune for drivability. Maybe Matt Collie will chime in here....