yeah dude, your not dumb, normally the orginal harness is suppose to be kept in tact... and lets say for instance in your case the b16 should have came with a cut harness, but you don't need that harness at all, you just need a few plugs off it (the ones to make vtec work), then you run all of that shit with your exisiting harness and throw it into your plug and then plug it into the ecu, and as far as all the other common sensors they just plug right in from the new motor to your orginal harness..... i'm sure you won't have a hard time finding a harness at all, just post for a complete Si or HF harness on honda-tech or hit up ebay....