[Suicide Junkie]

The way I have cloaking set up for P&N 2.6, is thusly:

Ship hulls get a gravitic cloak from 1 to 5, based on size.
You could expand this so that hulls are given a gravitic cloak of 1500 - (size in kt).

Then a level 850 grav scanner would see any ship bigger than 1500-850 = 650 kt, ie: battleships or bigger.

Active scanners are blocked by various levels of Scattering armor, in a simple 1,2,3 levels.

Passive scanners are blocked by stealth armor of various levels similar to active.

Psychic cloaking is provided by Master Computers.
The 40KT MC gives the best, the 20KT MC gives the least.

Temporal cloaking is provided by tachyon- technobabble components, which also protect against Tachyon Cannons (weapon destroying damage type)

Overall, at top tech, the cloaking components can defeat the top level scanning components.
However, the grav cloaking is still limited to the tiny ships, and after they add all the other cloaking components, they are quite weak, and fairly easy to destroy via conventional weapons or mines.

The sensor components are boosted in resource cost and size. The more valuable ones are extremely oversized.
For example, the high-end gravitics can only be carried on base-sized vehicles, and cost an arm and a leg.
Psychic scanners require tons of organics and plenty of space (lifesupport & crewquarters for the psychics doing the scanning)