I haven't yet seen a HiLo GANN indicator like this.
You will see the following signals using this indicator:
Strong buy - Stock is rising a lot Weak buy - Stock is rising a little Weak sell - Stock is falling a little Strong sell - Stock is falling a lot
It is truly up to you on how you want to use it. But one way to use it is to take the strong signals seriously and the weak signals less seriously.
This isn't the main indicator I use, although it can be used as a stand alone indicator. I suggest using it for confluence (agreement with other indicators).