Looking up some information on this subject, but I feel like all the research points to Iraq and their extreme interrogation tactics against Kuwait and some U.S troops as well. Did the U.S. use any interrogation methods of torture during the first Gulf War?
I have never seen any indication of reports implicating US forces in torture. The original judgment of legality of "enhanced interrogation techniques" regarded as torture was post-9/11, and therefore outside the scope of this subreddit. However, I can note that the Office of Legal Counsel (OLC) memos on the use of torture justified the legality of torture on August 2, 2002, on the basis of:
Necessity for self-defense purposes (effectiveness was added in later OLC memoranda).
Lack of Geneva Conventions jurisdiction based on illegal combatant status of non-state actors acting in violation of Geneva Conventions themselves.
The techniques might not themselves constitute torture.
Here is where we have differences from the Gulf War that may explain the lack of any allegations of torture.
Iraqi soldiers were not acting in wholesale violation of the Geneva Conventions. They wore uniforms and participated in armed combat and therefore were not in the gray zone between combatants and noncombatants that Al Qaeda operatives were argued to fall into.
The norm against torture was stronger at the time of the Gulf War. While the US had only signed, and not ratified, the Convention Against Torture by this point (ratified in 1994), the norm was more established than post-9/11.
There was a lack of real indication of necessity regarding the use of these techniques, therefore there was a lack of reason to argue for their legality.
However, this is not to say no torture occurred. The CIA has had a long history of involvement in torture, sometimes outsourcing it to local proxies as well (such as in Vietnam). This was typically in the course of involvement in insurgency support or proxy conflicts however, and not in a high-profile (and short, overwhelmingly successful) war against Iraq as in the Gulf War's case. Despite the prominence of training manuals and other documents discussing potential torture methods, some of which were acknowledged as inconsistent with US policy, I've seen nothing suggesting that the Gulf War involved the use of torture against Iraqi troops, though the CIA may have participated in such activities against some sensitive targets. The use of training manuals that contained instructions regarding torture relate to their use in Spanish-speaking states (i.e. Honduras), rather than the Gulf War, during this period.