You don't need a relay to do that sort of thing. Relays are used for high current applications such as turning on and off radiator fans, heaters, air-con etc...
If you can get your hands on a engine wiring diagram I can do it. Just splice a wire (first determine the voltage level with a multimeter) off whatever signal actuates Vtec solenoid, use a transistor wired up to a power supply (i.e. battery) the transistor is the switch (a small relay if you will) that turns on and off a light that can be connected in the circuit, with the vtec-solenoid signal that actuates the transistor.
I wouldn't waste my time on it though.
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