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most correct? the MPGuino, the DVOM will only let you know what lambda your at, the vacuum gauge, how much load you have on the engine.
Vacuum gauge: help you teach you and your foot to drive more economically
DVOM: Tells you when your in lean burn, and open loop ONLY
with their powers combined you will have the tools you need to drive better, but you wont have measurable data until you get to the gas pump, and you rely on your odometer (which is much less accurate than a calibrated MPGuino) With a MPGuino you will be able to find what speeds your most efficient at.
I have yet to see mechanical odometer closer than 2% error.
IMO the DVOM is not worth installing, and the vacuum gauge is questionable in its usefulness once you have a MPGuino.
Nobody on this forum with argue, a MPGuino, scangauge, or ultragauge will pay for itself.
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