A/C control help needed -1978 c-10

[midgainc]

I am just about complete with the interior Painless 10205 rewire of my truck. I am having difficulty wiring up the three prongs on the A/C control box. This is where all of the vacuum lines plug in. A separate power wire plugs also on the other side of the unit.) The wire colors I have going to the unit are Green, Brn/White, and Brown. The instructions say to Pins B,C, and E, I just dont know which is which. Does anyone have a photo of the back of the control unit showing the wiring plugged in?