Okay, from the top...
First pic I'm not certain, think it's one of the sensors on the Tstat housing.
Second pic, green plug (there's two of them on turbo models) goes to a knock sensor. One ks is under the front edge of the starter, the other near the front of the block under the intake.
Third pic, that's one of your two VSV's that hook up to the vacuum system under the intake plenum. Here's a link showing them and the vacuum lines...
http://www.cygnusx1.net/Supra/Librar...spx?F=1708&P=5
Parts # 17650 and 25860
Fourth pic, the object on the right side of the pic is the bracket that your 3000 pipe mounts to and which is mounted to your valve covers. Not sure about the bracket on the left of your picture.