Gaetti was inducted into the NWMSU athletic hall of fame, the "M-Club", in October 2003. He coached in the Houston Astros minor league system as a hitting coach with the AAA New Orleans Zephyrs from 2002 to 2004. Gaetti was promoted to hitting coach for the Astros on July 14, 2004 when the team dismissed manager Jimy Williams, hitting coach Harry Spilman, and pitching coach Burt Hooton. Gaetti remained in this position until July 12, , when he was fired by the Astros. Following the season, he was hired as the hitting coach for Tampa Bay's AAA affiliate, the Durham Bulls – a position he would hold through the 2008 season. After working at Baseball USA in Houston, Texas in 2011, Gaetti was named the first manager of the Sugar Land Skeeters. The independent team began play in 2012.