i just got my ef hatch that wasnt starting right i got that fixed now my vtec is not poping at all it has a d16z6 swap and its obd0 the ecu is a pg7 the vtec is wired to the ecu but its not doing anything how can i fix this problem

do i need a different ecu or wiring harness or can i just get a new vtec ecu and wire the vtec to it?? i would really appreciate any help you guys offer me thanks