Words of advice!
I bought budget tuck harness for my B20V into my EK, I wanted to retain all options, AC, CC, etc.
When I installed the motor and harness etc, after getting the car running I noticed my ac compressor wouldnt kick on.
Come to find out, the engine harness I bought from crx_si-r
AKA CJS Wiring
doesnt come wired to retain AC function. So in order to fix this I had to run the 2 necessary wires from (obd1 ecu) A15 and B5 (obd2 ecu a17 and c5) to the green chassis connector. After doing this, my AC compressor kicks on.
This may be common on all swap harnesses, I dont know but Im just sharing my experience with the CJS harness I bought.
Just a heads up.