Specific vs common sensors ?

[tbontob]

This is a question for the pros...

This is what I am given to understand:

-Some ships must have a specific sensor installed in order to benefit from it. I believe combat sensors and multiplex tracking would fall into this Category.

-But apparently some sensors do not need to be installed on all ships as the ships without it can benefit from the ships in the fleet that do have it. In most cases, it would be needless to install this component on every ship.

Here is a list (complete, I hope) of the various sensors available as components.

Combat Sensors
ECM
Gravitic Sensors
Hyper Optics
Long Range Scanners
Multiplex Tracking
Neural Combat Net
Psychic Receptors
Scanner Jammer
Tachyon Sensors
Temporal Sensors

Can anyone tell me which is which?
I'm really in the dark on this!