don't follow those instructions. you're not running s300 are you? just connect the narrowband output from the plx to d14 (stock o2 leaving the stock o2 cut). you really don't even need to do that if you have a guage. what you're doing is if you want to datalog/tune yourself and have it show up in the datalog. in that case you would disable closed loop and connect the wideband output to d14.

hondatas eld hack allows you to datalog and always have a wideband connected to the ecu. personally i rather do it the other way and there is no need to always have a wideband signal running into the ecu at all times anyway...only when tuning. i have not seen one cust that has tried to set it up that way work (i'm sure there are those out there that do), and it's easier and less headache to run it through d14. if you do want to tune and log yourself then install slip connectors so that you can switch back and forth between narrowand output and wideband output from the plx.