Like many traders, I have relied on the RSI / MFI indicators to determine overbought/oversold conditions. Occasionally, these indicators fail to reflect a true top or bottom of a price move. However, I found that when these indicators had confluence with one another--when *both* the MFI and RSI were in overbought/oversold territory at the same time--they tended to be much more reliable.
For a couple weeks I just combined the two indicators into a single pane, constantly (and annoyingly) adjusting the scale so the overbought/oversold lines would match up. Finally, I determined to learn PineScript enough to hack the RSI/MFI into a single indicator that averages the two and plots them on a single line.
Since the RSI/MFI have overbought levels set at 70 & 80 (respectively) and oversold levels at 30 & 20 (respectively), this averager splits the difference and sets them at 75/25.