Need help identifying under hood components

the white part of #3 is a vacuum switch it turn on one of the turn signals to show that the engine is under a lot of power. the switch has a habit of leaking vacuum. the metal part might be a control switch. so the two systems dont interfer with each other. the black part looks like something is missing. my idea DONT try to use it. if you want the car to look stock just make it look like its hooked up but plug the vacc hoses so you will not have a vacc leak.