Pair Trading, Statistical Arbitrage strategy Trading EA

Hi,

The indicator plots two pairs on the screen and then calculates the standard deviations of the spread difference of the two pairs.

‌Basically I have a very simple strategy When "Standard Deviation" is at +-2, sell high priced instrument and buy low priced instrument and exit at the trade at when Standard Deviation reverts to mean.

should be ok to work on any time frame... also the EA should be able to be backtested before going live.