wow, yea you should have just bought the rpm activated switch from summitracing.com. there about 45 dollers, which is less than the shift light and you dont have to have a hugh yellow light light up every time vtec is activated. i cant help you on the light because i used the rpm activated switch, which by the way is the cheapest, but defidently not the best way to activate vtec. the best way obviously is a vtec controler of some kind. i would return the light and go to summit racing and buy the switch and research on how to hook it up. you will also need a auto relay because the switch sends out a negative signal to activate whatever is being activated, in our case vtec, and that is obviously a problem because vtec needs at least a 12 volt power supply to turn on.
you may or may not be wondering about the vtec oil presure switch on the soleniod. it is not used with the rpm activated switch which is the main reason that the rpm activated switch is not the best way to activate vtec, it dosent sence the engines oil presure therefore it turns on regardless of the engine conditions which isnt good.