What should I do?

[thermal]

If your car in non-VTEC right now, all you have to do is run 2 wires and a ground. The 3 wires will be ran through the firewall:
1. VTEC solenoid signal
2. VTEC oil pressure switch
3. VTEC oil pressure switch ground

That is if you use a VTEC head... non-GSR head.

If you use a GSR head, then you will have to run an IAB (secondary butterfly) wire the the ECU.

This also depends on what ECU you are using. OBD1 is the way to go. Some ECU's requires a knock sensor, but some motors doesnt have a knock sensor.

Whenever you've decided on what to get, post what combination you want to rig and I will help you with the wiring. This is all easy stuff.......