Is a pretty unique indicator indeed that due to its smoothing provide nice entries. Your Entry signal is when the histogram, which is the longer term willy is green that signalizes strong momentum. If you then receive a momentum change which is the dot on the short willy or you breach the -30 to -40 area it is a strong buy signal.
Also, this is my first V4 Script thanks to Tradingview to adding to the platform :)
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.