Duff was found not guilty of murder but guilty of participating in an organised criminal group. When he was found not guilty of murder, Te Tomo's charge was downgraded.
Te Tomo pleaded guilty on November 17.
Justice Priestly said Te Tomo assisted Duff in evading police during October 2009.
"Mr Duff was on the run. You knew he was on the run," he said.
"He was convicted of one of the counts he faced."
Judge Priestly said text messages on Duff's phone showed Te Tomo had helped with clothes, money and accommodation, while he was wanted by police.
"As far as you knew, Duff was wanted by police in connection to a homicide," he said.