In the attached file, you'll will find an example of a fair value gap combined with a moving average strategy. You'll also find a simple moving averages crossover strategies using the default parameters.

Take note that the moving average is created at the H4 timeframe, thus the H4 timeframe must be a multiple of the strategy tester/chart timeframe. To avoid errors, it is always recommended to set the chart/strategy tester to the M1 timeframe.

Also, notice that the result of this strategy may vary according to your broker market data/liquidity provider. Few changes in the price movement may completely turn this to a losing strategy. Do your own backtests and, if necessary, optimize it again.