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I used multiple vacuum gauges to fine tune the Webers on a Ferrari V-12 when doing a tune-up. That car was difficult to keep in tune over time, but it wasn't the carbs! The DRIVER had a tendency to "lug" the engine and foul the plugs.
Wtih two distributors and four sets of points it also required a close eye to keep the ignition in synch.
The Webers? Pretty much dialed them in the first time I tuned the car and they were "done". I loved to "test drive" that car and make sure it was "right".
Ernie
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