This indicator is the same indicator created by Gregory Mannarino. It measures risk in the market:
Extreme 300+ High 200-300 Moderate 100-200 Low 50-100
The formula is simple: MMRI = DXY * US10Y / 1.61
The chart shows a number that represents the risk in the market at all times. It is useful to have it at all times no matter what chart you are looking.