You MUST hear big diference in the sound of the engine at some rpm level. If you hear the VTEC enabled, then you have enough oil. in that case you do not have any electrical problem. Electrical problem is the missing VTEC. VTEC solenoid does not open valve for VTEC oil.
If you hear the vtec, but car does not accelerates differently (as you expected) but still accelerates, then try cleaning complete intake and exaust. Cleaning after 100000 miles of zc1 engine gave me 0.4 sec (and that is not vtec engine) As blinx said, vtec is not NOS. You fill the difference but you will not jump forward.