Originally Posted by Jap

You need to either convert to OBD1 or use the one of the output scripts used in Turboedit or another OBD0 editing program to activate VTEC ..

I would choose a OBD0->OBD1 Jumper harness and a P28

Then you need to wire in the VTEC solenoid to A4 on the P28 and jump A4 TO D6 to bypass the pressure switch ..