hi guys, i just bought a hks EVC 4 boost controller for my 2001 jap sti, unfortunally there is limited fitting instructions with it, i know where 2 of the 3 connections go, but there is one with 4 wires that i'm not sure where it goes? the wire colours are red,green, yellow and pink, enclosed is a pic of connector.
thanks guys!

http://i254.photobucket.com/albums/h...ontroller2.jpg

 

I believe that plug is the optional 4 pin plug for a scramble boost trigger switch.

HKS USA EVC Scramble Boost Control Trigger Switch

 

Just found the installation manual for this EVC and yes it is boost scramble if it is the four plug......installation instructions can be found here>>>

http://www.hksusa.com/content/pdf1643.pdf

 

thanks a lot mate, thats great, getting the car mapped in 3 weeks by andy forrest so needed to get the controller fitted!! many thanks