Heck, I'd be happy with just my little corner of it

Actually, it really bothers me that this circuit would even work to begin with. The concept that a vehicles A/F mixture is reliant on a sensor that is so dependant on its supply voltage is abhorent. The environment is depending on that sensor. Its output should be only dependant on the air pressure, and independant of small supply voltage changes, as that is the only way that we can have absolute confidence in its readings.

But that doesn't detract from the enjoyment of a challenge, and at least Fusto can take advantage of it.