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if your speedo isnt working then the vtec wont kick in. the ecu doesnt pick up that your moving so it thinks that your trying to hit vt while sitting still. if the car isnt in gear and going then the vtec wont kick in.
the speedo sends a signal to the ecu that tells it that the car is moving. did your tranny come with a digital speed sensor? if so then all you have to do is wire it up, you still wont have a speedo unless you buy an eg or ek cluster but your vtec will kick in.
vss is located under the throttle body, behind the starter. look at it then comapare it to the one on your stock tranny.
first of all, are you trying to get vtec to pop while the car is just sitting? bc it wont, the car has to be driving, cant just rev to it.