Grays came out on top in this turgid encounter at Millfield but Farnborough would have been disappointed with two refereeing decisions which had a major impact on the outcome.
In a scrappy opening Bradley Fortnum-Tomlinson had the first chance of the game for Grays latching on to a through ball with only Minter to beat he slid the ball just wide of the post.DD Dumaka was denied moments later by Minter who blocked his shot on goal.
Despite these early scares it was Farnborough who went in front on 15 minutes Krans netting after good work by Leacock.
Grays were back on level terms in the 25th minute Tomlinson scoring his fifth goal in his last six games after good work by Angyemang.
On the stroke of half time Gallagher saw Red for Farnborough following a nasty tackle on Dumaka
Grays were quick out of the blocks at the start of the half with danger man Tomlinson seeing his shot whistle past the post.
Grays Joao Carlos saw his effort turned round by Minter for a corner from the kick Jake Hutchins powered his header just wide.
The Farnborough youngsters were beginning to tire under the Grays pressure but not before Wright came close to regaining the lead Johnson denying him with a smart save.
Grays went in front on 71 minutes when they were awarded a controversial penalty after a tackle on Carlos.Tomlinsons kick was saved by Minter only to see Carlos score from the rebound.
It was harsh on Farnborough but to their credit they bounced back applying pressure on their hosts goal without securing a breakthrough.
Substitute Correy Davidson wrapped up the game for Grays registering his first goal on his return to the club in the 90th minute burying his shot into the bottom corner after good work out wide by fellow sub Alex Addai.