so whats the turbo duty solenoid?
and the neutral swith and 5th gear switch on a 5peed t2?
oh and the little black boxes on the end of wires around the motor they look like a resistor box but only about half inch by half inch and are just grounds i guess and help interference?

 

duty solenoid - there are two they are pulsed (or buzzed) to allow variable flow, not just on/off. One is for idle control, the other is for boost control.

neutral/5th switch - There is a matrix of switches, sensors, & functions showing all the interactions in the "fuel & emissions" section of the FSM.

You right about the little black cubes. They are capacitors that filter electrical noise from the ground side of the sensor signals.

 

Electronic boost control.

Various minor ECU functions, mostly for emissions control and idle speed control. The 5th gear switch also incorporates the reverse switch, which turns on the reverse lights.

Not grounds; condensors.