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your car needs both front narrow band sensors to run right. you have to install a 2nd bung as close as you can to the primaries (same location as the other bung is) in the 10 to 2 o'clock position. so you will have 2 bungs in the header. Your car was trying to adjust for the missing o2. had nothing to do with your gauge. The front 2 narrow band sensors are what the ecu uses to maintain the air fuel ratio for each side of the engine. Your wide band is only for your gauge and the OBDII plug from your gauge is so you can data log wide band AFR.
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real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1
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