I think it is pretty clear that people are needing to rely on one to get the 750 to work right, compared to most of us being able to get carbs to be reasonably close without a gauge.
I myself use a gauge because I like to be precise, not guess at how the car is running or by some crude method like "looking at plugs"
Why leave good tools in the toolbox? Chrysler trained me to use O2 sensor readings when diagnosing problems with EFI (even before that with those damn feedback Holley 2bbls on 2.2 engines), why should I throw that most excellent tool away when working on carburetors?
If you had a gauge staring you in the face... you can't miss the poor fuel control of some carburetors. Having information is good, better than being ignorant.
