Here's the situation...I'm pulling a B16 out of '00 Si to go in a '98 EX civic. (I know the whole obd2a, obd2b thing, let's not turn this into another "Can my 89 harness work with a 00 ecu?" threads) I pulled the engine harness through the firewall today and noticed a harness still inside the car that it ran from the ECU to the bottom of the fuse box. I know the engine harness and ECU need to match, but am I going to need to have this other harness to match the ecu also, or do all those wires just run gauges and stuff? Please don't tell me I need this to come out too. These wires split off and run all up underneath the dash. I am just now finding out this harness existed and it's got me stumped. This is my first swap experience and after one day of work, I have one more drive axle to take remove, then out comes the engine!!
All help is GREATLY appreciated

 

Guess nobody knows what I'm talking about??? Seriouslly, theres more than one harness that is plugged into the ECU...I've done searches and gotten no help


Oh yeah...motor is out and ready to install

 

Yeah the the harness that leads to the engine and that harness for the rest of the car