ECS p/n 4714a

what is this? its not hooked up to anything. do i need it for something? having problems with my 83 d-50 2.6L vacum lines and noticed it. also, does any one have a map for this version of lines? i have a haynes manual but its not very discriptive with pics on this vacumn. thanks for any help.

Sorry cant be any help here, almost all the trucks wires to the factory ecu are left unplugged or modified. If you trace out the wires on a separate piece of paper might be clearer. Seen the pic and its cluttered. Google aint got anything on the part number, but a pic might help.