well, I would say you could use the 1-wire vtec code, but that hijacks the automatic tranny lockup solenoid. So, I would just use a VAFC with your stock PS9 ecu. Or get someone to supplant vtec maps into a automatic ECU, and use vafc or rpm triggered switch to activate vtec.

I dunno, there is no "right" way to do it.

-PHiZ