This Datacron unlocks the Codex Entry - Galactic History 35: The Gank Massacres
This datacron holds unheard of power and knowledge collected by an ancient race. You access its power and discover writings which are clearly only one small piece of a massive galactic history:
Addicted to the spice ryll--which drove them into a murderous frenzy--the Porporite species had become a threat to the galaxy. The Neimoidians had a monopoly on ryll and, terrified of the coming Porporite swarm, turned to the Ganks to stop the Porporites quickly.
The Ganks were mysterious, cybernetic mercenaries that often worked for the Hutts. With the Ganks' reputation as cold-blooded killers, the Neimoidians were confident they could handle the Porporite armies. But the Ganks' solution was to eliminate the entire Porporites species, and they hunted the Porporites to extinction.
Encouraged by this "success," the Ganks began wiping out other species, quickly becoming a far greater threat than the Porporites. The Jedi took up arms against them, but Supreme Chancellor Vocatara was forced to commission the first juggernaut droids to end the Gank menace for good.
Coordinates: X 3339 , Y -3098
To reach this Datacron you will first need to go to the Red Light Sector area on Nar Shaddaa. From where you land on the speeder run northeast to the elevator that takes you down to the Gauntlet Gang Area (Careful if you're low level, it's a heroic area). If you're having difficulty finding where this elevator is take a look at (Screenshot 1). Once you're in the Gauntlet Gang Area head southwest to where I am in (Screenshots 2 & 3) to start your Datacron hunt!
In Screenshot 2 you will see a crate in front of me and a metal thingy. You need to jump onto the crate and then onto the metal thing. From here you will want to run up the awning (Screenshot 4). At the top of the awning jump up onto the platform and you will switch zones to the "Plaza Catwalks". To the south up here you will see an elevator which you will need to take to the Red Light Sector Catwalks. The second you come out of the elevator you will be able to see the Datacron in the distance (Screenshot 5).
It is pretty straight forward how to reach the Datacron from here.