Following his playing career, Tamargo has had a lengthy career as a minor league manager, starting in with the independent
Miami Marlins. He then joined the
New York Mets organization, for which he worked from until in various capacities. In , he managed the
Binghamton Mets to the championship of the
Eastern League. In , Tamargo moved the
Houston Astros organization, managing the
Kissimmee Cobras. The next season, , he won his second championship as a manager with the
New Orleans Zephyrs of the
Pacific Coast League. From until , he was a coach for the MLB
Houston Astros. In and , he managed the
Brevard County Manatees in the
Milwaukee Brewers organization, and in he managed the
Durham Bulls, a farm team of the
Tampa Bay Devil Rays. On January 13, , Tamargo was named the manager of the
Everett AquaSox in the
Seattle Mariners organization. He was named manager of the Class-A
Clinton LumberKings of the
Midwest League after the '09 season. During the
2010 season, his son
John Jr. served as hitting coach of the
Lansing Lugnuts, which played in the same league. The two managed against each other in one game when John Jr. served as the Lugnuts acting manager. His son was promoted to manager of the Lugnuts before the 2012 season, and was named hitting coach of the
Dunedin Blue Jays prior to the 2015 season. In 2026, Tamargo was named manager of the
New Hampshire Fisher Cats the Double-A affiliate of the
Toronto Blue Jays. Tamargo was named to his current position as Latin America Field Coordinator after the 2010 season. ==References==