hks electronic boost controller

[c_vang]

I have a HKS electronic boost controller not sure what model it is but it has 4 nipple 3 on top and 1 on the bottom. The three on top are number 1 2 3 and the bottom one is not number. I was just wondering witch line go where and the bottom one use or not? If anybody can help me.

 

[annoyingrob]

which HKS boost controller? There are like 7 of them.