Dean Jarvis took a throw-in on the left flank which was cleverly headed by Matthew Shevlin into the path of McGonigle, who cut in from the left and fired a shot under the body of Jonny Tuffey from an acute angle.
In a first half of few chances, Ben Kennedy curled a free kick narrowly wide for the home side.
But the game turned on its head when Crusaders struck twice in just over a minute.
Firstly the home side stretched Coleraine on the left hand side and the ball was worked via Philip Lowry and Paul Heatley to in-rushing left-back O’Rourke, who found the net with an assured right-foot finish.
Just over 60 seconds later Crusaders were in front as Coleraine skipper Stephen O’Donnell lost his footing in attempting to make a clearance and defender Daniel Larmour was on hand to blast home the loose ball, via a deflection off the grounded O’Donnell.
Coleraine spurned a a great chance to level on the hour mark when Jamie McGonigle latched onto a Dean Jarvis throughball and glided past the out-rushing Tuffey but the striker could only put his effort into the side netting.
However, the Bannsiders did square the tie on 70 minutes with a goal of absolute quality.