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-Each ship would have
---1) a combat sensors for certain weapons (ie direct fire)
Point Defense Cannons can be affected by combat sensors. If the enemy uses fighters, it is a good idea to put CS on any ship with PDCs.
---2) multiplex tracking (if it has one or more weapons)
Useless if the ship only has 1 weapon.
Generally, these aren't that useful unless the ship uses weapons that need to target different ships (Allegience Subverters, Ionic Disrupters), or it has a lot of weapons (probably at least 5).
---3) the neural combat net.
This is only useful if you have one or more ships with much more than 20 experience. You can train your ships up to 20. If all of your ships are at 20, and none are higher, these have no effect. You need at least 1 ship with high experience to get any benefit. Otherwise, the 30 KT are wasted.
---4) the scanner jammer.
Generally, it doesn't matter if the enemy can see what is on your ship. Cargo-carrying ships can make good use of these though.
Consider using Scattering Armor. It's defense bonus stacks with ECM, and it provides scanner jamming.
-At least one of the ships in the fleet would have
---1) the long range scanner
---2) one of the sensors (psychic, tachyon, temporal, gravitic, hyper-optics) to
-------a) penetrate the cloak of the opposing fleet and/or
Correct.
-------b) cloak our fleet
No. You need either Stealth Armor or a Cloaking Device on each ship to cloak the fleet. Scanners only defeat enemy cloaks, not cloak your own ships.