Gillingham and Carlisle will need a replay to determine who will make the FA Cup third round after a 1-1 draw at Priestfield Stadium.Luke O'Neill curled home an excellent free-kick from the edge of the area to give the League One side the lead but Danny Grainger's penalty levelled for Carlisle after just 18 minutes.Neither side could find a winner, leaving a long midweek trip for the Gills.The hosts went in front in spectacular style after five minutes. After Conor Wilkinson had been upended, O'Neill curled his free-kick past Jack Bonham.The Cumbrians almost replied immediately but Kelvin Etuhu's well-struck shot flew wide.Carlisle did manage to equalise from the penalty spot though as Mark Byrne brought Tom Parkes down inside the area and Grainger did the rest.Gills' Tom Eaves went close after he latched on to a smart through-ball from Wilkinson but neither side was able to find a clinching second goal.