Yes I would ground the wire (but that doesnt have anything to do w/ the vtec)

Give a little more detail about the swap ie:
1. Did you do the swap?
2. What ECU is in the car?
Does the Speedo work? (for the retards who are curious as to why I asked this; B/C if the speed sensor is broken, the Speedo nor vtec wont work!)
3. Has it ever worked in the past?
4. Who wired it?