I see there's two input wires for the ECT2 port on the Civic, and there's two voltage outputs from the converter. Do these just line up with each other (if so, which signal goes to which input for the ECT2) or is each voltage output the same signal, perhaps one for sending to the ECU and another for an ethanol content gauge? If they're the same signal, do both need to go to the ECT2 port or just one? And if it is just one voltage output to the port, then what other wire needs to go to it (I see there's two wires going to the port plugging into the ECT2).
I bought a kit, but it also uses ECT2 for readings. Be aware, it looks like the OBD2 Evap Self Checks/tests may not run without an ECT2 Reading. It will yield a Not Ready Status on inspections.
Some places allow one. Few allow two or more. So if you have an O2 Disable too, you may not pass inspections.
Worse still, it's a PITA to get our Civics to complete a drive cycle that clears the Evap System. So, while COVIDling and racking low miles it takes either a concerted effort or weeks to have Evap Ready.
I'm eventually going to run a pigtail up from ECT2, have a pair of fuses to split the line right under the hood, and two wires run down the same pigtail to dual plugs. I'll be able to leave both eth/ect2 plugged in, and a few weeks before annual inspection, swap the fuse from one spot to the other. Also a quicker way to return to factory tune.