Actually here, I found an article for you.
http://www.honda-tech.com/zerothread?id=1004852
9. Repeat the process for the Vtec OP Switch.
The connector for the Vtec OP Switch will have two wires. (one blue/one black)
The blue wire is hot, connect this to the 16-18 electrial wire.
The black one is for the ground, just connect this wire to the ground
on the thermostat housing where the other ground wire is.