It was Southend's first away win in 13 matches and moved them up to 13th place in the table, just two points off the U's. But Tilson is still anxious to ensure that his side are mathematically certain of staying up before looking upwards.
He said: "It was a good derby win but the three points was the most important thing to me. We've now won three out of our last four matches and we're going in the right direction.
"We're looking at getting to 51 points to make sure we're safe.
"We've had injuries to key players and the most important thing is we stay in this division."