I'm assuming that is because i would just have the 02 sensor hooked up to my a/f guage and not to my ECU, but my guage has a narrowband output in addition to the wideband output(so you can have both) would this satisfy the ECU for a/f readings and not throw a CEL, or is the ECU input a wideband signal.

and if it is a wideband signal, could i just splice the wire so that a signal is being sent to both ECU and guage?