Douglas Glynn yesterday admitted to placing a tracker device on Gately's car in Belfast in 2017 before the planned hit.
The shooting was foiled by gardaí but the Hutch target was shot and seriously injured in a separate shooting the following month.
Glynn (37), of Fitzgibbon Court in Dublin 1, will be sentenced next year by the Special Criminal Court after being remanded on continuing bail.
Gardaí consider him one of the last remaining senior cartel associates in Dublin and sources described him as a "logistics man" for the gang.
Following his arrest in 2020, a follow-up search led to a number of guns being recovered in the north-inner city and detectives believe Glynn was in charge of storing the weapons.
While awaiting trial he was also arrested as part of a separate probe into serious crime by detectives from the Drugs and Organised Crime Bureau.
Glynn and two associates were quizzed while a large sum of cash was seized, but he was later released without charge.
He initially denied the charge against him but was re-arraigned yesterday before the non-jury court and pleaded guilty to participating in activities of a criminal organisation.
Glynn is the fifth man to be found guilty in cases relating to the failed bid to murder Gately in Belfast.
Detective Sergeant David Carolan had told the Special Criminal Court he was aware that Gately was involved "in a feud with the Kinahan organised crime group" and that Gately "had a wider association with the Hutch organised crime group".
He said Gately was "being targeted by the Kinahan organised crime group at the time".
In his opening speech, Dominic McGinn SC, prosecuting, said the evidence in the case against Glynn was of a "circumstantial" nature involving CCTV, photograph, mobile phone, tracking device, fingerprint and Garda observation evidence.
Mr McGinn said gardaí would tell the court they were aware of a plot around the time of April 2017 but did not have precise knowledge of the target until the arrival of Estonian hitman Imre Arakas in Dublin on April 3, 2017.
Counsel said that gardaí were aware of Arakas' arrival in Dublin on a flight from Spain and tracked his movements.
They later searched a property in west Dublin and found Arakas next to a note written in Estonian but with the words 'James Gately, Dublin criminal' written in English.
Mr McGinn said a tracker had already been found in a van driven by another male when he was stopped by gardaí on February 28, 2017, and evidence regarding trackers would "feature largely" in the case.
Mr McGinn had also said it would be the State's case that gardaí contacted the PSNI about the plot and a tracker device was found on Gately's Toyota Avensis.
The barrister added that CCTV would show Glynn place the device on Gately's car, before he and two other occupants of a Peugeot van drove back to Dublin.
Counsel said evidence would show that five Blackberry devices were seized from Glynn's Ashtown residence.
Mr McGinn said an inference could be drawn that one of the users of the devices was involved in "ongoing" criminal activity.
He will be sentenced on January 14.