As of the end of the 2012 season, O'Connor is fourth in the all time League of Ireland goalscoring chart with 178 league goals. - 120 with Bohemians, 54 with Dundalk, 4 with Athlone. He also netted 15 goals in the FAI Cup (14 with Bohs, 1 with Dundalk) and 2 goals for the Irish full international team. O'Connor was capped twice at youth level.
He was also a very successful manager and has managed Athlone Town, Dundalk and Bohemians. His best period as manager came during in his 5 year tenure at Athlone Town where the League Championship was won twice and the League Cup was won three times, with the Tyler All-Ireland Cup also making its way to St. Mels Park. O'Connor then took over Dundalk in time for the 1985/86 season. He picked up more silverware during his time at Dundalk winning 2 League Championships, an FAI Cup and 2 League Cups until he left Oriel Park in October 1993. He was not out of football long as he returned to his spiritual home at Dalymount Park on 14 December 1993 where he stayed until the summer of 1998. During this time he also managed the Republic of Ireland national under-17 football team in the 1994 UEFA European Under-16 Football Championship held in Ireland in May 1994.