lol, the rpm activated switch is the cheapest way to go but its complex in actually getting it to activate vtec, heres why. when the rpm's reach the desired point of activation it sends a -12 volt source to activate whatever, vtec requires a +12 volt signal minimum to activate. therefore an auto relay is required to convert the source. this process isnt complex but its not easy. i had my friend, who is an electrical engineer hook up mine. i have the same swap as you have, and my vtec runs strong starting at 4400 rpm. you can buy one at summet racing.com for like 50 bucks i think it was.