The hosts took a 9-7 lead into the break after two Richard Mill penalties and one from Joe Helps. Gala's points came from a converted penalty try.
In the second half, Grant Somerville added a second try for Gala. Lee Millar converted and then kicked a penalty to put the visitors 17-9 ahead. Andrew Skeen kicked a fourth penalty for the home side, but Gala held on and leapfrogged Ayr at the top.
In the only other match played Dundee HSFP secured an important away win against Stirling County. The Taysiders came through 27-24 and although they are still second bottom they are now just one point behind yesterday's opponents.
Dundee HSFP's three tries came from Neil Dymock, Jack Steele and Iain Wilson while Jamie Urquhart kept his cool to kick 12 points. The hosts scored tries through young talents Mark Bennett and Ruairidh Leishman, while Stuart Edwards kicked 14 points, but it was not enough.
In the RBS West Regional Cup Ayr turned on the style at Ardrossan Accies to win 74-11. Glasgow Hawks also made it three wins from three in the group stages with a 31-5 victory at Whitecraigs. GHA defeated Hillhead/Jordanhill, Greenock Wanderers got the better of Dumfries and Hamilton thumped West of Scotland 71-0.
In the RBS Edinburgh Regional Cup Heriot's crushed Lasswade 107-0 and Currie turned on the style to win 45-7 at Musselburgh. Edinburgh Accies edged out Boroughmuir and Biggar got the better of Murrayfield Wanderers.