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2. The ST-12 gave us the ability to install a wideband oxygen sensor into each primary tube of the headers. The O2 sensors will tell us the exact air/fuel ratio of each cylinder in real time while the engine is running. Reading the spark plugs will tell us the same info, but only after we’ve ran the engine, which could be too late if we don’t get the nitrous tune-up correct the first time we hit the button.