Compare - Oscillator vs BTC momentum

I've made a simple indicator to compare the momentum of a trading pair against the momentum of BTC to the dollar. I use it to see how a pair is affected by BTC's momentum... I wouldnt use it to trade off alone, but it can be a useful tool alongside other indicators.

The time range can be adjusted, but I wouldnt reccomend setting it to anything over 12M, or under 1W.... as I'm not sure if it would work.

Any feedback is welcome!

This is an idea I had after looking at a wonderful visualisation made by BarclayJames, link below: