The indicator can chart the spread between 2 instruments as a difference or as a ratio.

Settings:

Instrument1 -  Enter a string of first instrument exactly as mentioned by broker

Instrument2 -  Enter a string of second instrument exactly as mentioned by broker

Multiplier1 - A multiplying factor for first instrument

Multiplier2 - A multiplying factor for second instrument

ChartDifernce - A boolean which will chart difference between 2 instruments, set to false it will chart spread as a ratio

The spread chart appears in a separate window and then basic indicators can be applied to it like shown in the pictures.