We enter when there is a cross with the two lines.
If the blue line goes over the green line, we buy EURUSD and we sell GBPUSD.
If the green line goes over the blue line, we buy GBPUSD and we sell EURUSD.
We close the trades when there is a profit of 15 pips.
We can also close the trades when there is an opposite cross.
The indicator and the EA have to be applied to both charts, timeframe M30. You have to set B1 (the weakest pair "EURUSD") and B2 (the strongest pair "GBPUSD").
I attach different settings with several pairs.
Download : Correlation Strategy EA (available in the Elite section)