If the EJ207 you received has the engine harness intact (like mine), you just need to add a AVCS bulkhead harness, which you can either purchase from iaperformance.com AVCS Bulkhead wiring kit
, or have someone on this board make one for you, PM me if you're interested.
I got lucky and bought the wiring from someone in the classified. And here is the DS1 AVCS wiring instruction
. I'll take pictures when I wire mine up this weekend.