After moving to Wellington in 1971 Tamati took up rugby league, joining the Petone Panthers club.[5] He later played for the Upper Hutt Tigers and the Randwick Kingfishers. He made the Junior Kiwis in 1973. A Wellington representative, Tamati made a name for himself as a tough player.
He moved to England in 1982 and had success with both Widnes and Warrington. During the 1984 season Tamati played on Saturday for the Northcote Tigers in the Auckland Rugby League competition and then flew down to Wellington on Sundays to play for the Randwick Kingfishers.[5] During this season Tamati also represented Auckland.
A Wellington representative and New Zealand international, Tamati played 52 times for Wellington and for the Kiwis from 1979 until 1985.[6] He is perhaps best known for his fight with Australian prop Greg Dowling which continued on the sideline after both players had been sent to the sin-bin by French referee Julien Rascagneres.[7] Tamati won caps for New Zealand in 1979 against Great Britain (3 matches), in 1980 against Australia (2 matches), and Great Britain (3 matches), and France (2 matches), in 1981 against France, while at Widnes in 1982 against Australia (2 matches), and Papua New Guinea, in 1984 against Great Britain, in 1985 against Australia (2 matches), in 1985 in the 1985–1988 Rugby League World Cup against Australia, in 1985 against Great Britain (interchange/substitute), and in 1985 in the 1985–1988 Rugby League World Cup against Great Britain.[1] In total Tamati playing in 37 games for the Kiwis, including 29 test matches.
Tamati was employed as a rugby league development officer with Warrington Borough Council for nine years from 1989 to 1997 when he left in 1997 to take up a full-time position coaching the Lancashire Lynx.[11] Tamati had previously been coaching Chorley Borough part-time, but the club's rebirth as the Lancashire Lynx prompted him to take up the roll full-time. Tamati was released by Lynx at end of the 1998 season, after failing to agree a new contract.[12]
In 2024, he joined the second season of The Restaurant That Makes Mistakes, as he was diagnosed with dementia in 2021.[18] He was mentored by Chef Ben Bayly to become a chef.[19] On episode 2, he personally served dishes for his former teammates, including Hugh McGhan, Dean Bell, Frano Botica and Dane O'Hara.[20]