I don't think u have to change the water pump over but you will have to use the knock sensor due to the fact that you will throw a code with that ECU running the vtec.

Easiest way to do it is to remove one of the bolts from the alternator bracket & thread the hole into the motor for the knock sensor, you may have to extend the wires ( i recommend that u sodder them & do it properly if u have to extend them).

Hope this helps ya out.

Good luck!