Rangers could gain a psychological edge over Celtic in the Scottish Premiership title race come the end of Tuesday night. Philippe Clement’s side, after comfortably taking care of Livingston at the weekend, now sit three points behind the Hoops following their slip up away to Aberdeen. The Pittodrie charges are the opponents at Ibrox this evening and because Gers boast the best goal difference in the top-flight, all three points will nudge Celtic off the top position before their game at Hibs tomorrow. Clement made six changes to the team for the triumph over a struggling Livi on Saturday as h…