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i would rate a good vacuum gage a 4. a/f and closed loop are interesting but more indicative of system health. if you get into the fuel enrichment part of the map, a/f and loop would let your know but unless you got a way to trim fuel on the fly, can't see where it would help much, still i like to watch the o2 sensor on my DVM, that's just part of the fun. Injector dwell or duty gives you actual instant % of full fuel flow per unit time, as i eluded to in another thread.
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