Gabo has won multiple championships in the grassroots level, including one in the MPBL, one in the Pilipinas VisMin Super Cup, and two in FilBasket.
The Mapúa product first began his amateur career with the Quezon City Capitals of the Maharlika Pilipinas Basketball League in its inaugural season.
During the 1st Conference, he became a key player in Basilan's VisMin championship run, winning MVP honors during the Mindanao leg of the tournament.
[6] With Nueva Ecija, Gabo won two more professional championships and was also selected to the All-MPBL First Team after averaging 7.1 points, 2.5 rebounds, and 5.8 assists.
[8] Later that year, Gabo is one of many Rice Vanguards players who made the move to the expansion Pangasinan Heatwaves under his long-time coach, Jerson Cabiltes.