Add it to your 1H chart - This is important!
It is highly flexible: the time resolutions can changed - except for the current resolution of the chart.
The lookback periods for all timeframes are set to 14 - but they can be changed as desired.
3 levels of overbought (70, 80 and 90) and oversold (30, 20 and 10) are defined and highlighted.
Also, when any of the series goes into overbought or oversold, they change colour: teal for oversold and fuchsia for overbought.
Tip if you find it useful: https://bit.ly/2VJHOQT
Also, filled in the 30 to 70% space.
Also, cleaned the code for the overbought and oversold and added the midline at 50 to ease the reading.