ok so i got an msd rpm activation switch to activate vtec in my 90 si........but when i read the wiring diagram it says that both of the outputs are grounds, and vtec needs a 12v source.......so how do i get that to activate vtec? ive searched and keep reading about some relay, but i was never told to get a certain relay, is it just a relay on the car or what do i need? please help me asap cuz it sucks having a slow motor lol.....thanks!