This script shows Fib and Gann levels. It is basically reverse engineered stochastic. Default levels include golden ratios (0.618 and 0.382) and Gann ratios (0, 0.25, 0.5, 0.75, 1.0). There are two methods of calculating swings, one is based on time alone as in standard stochastic and another is partially time dependent. A comparison is shown in the chart below.
I found 0.42 and 0.58 are interesting retracement levels for BTC on long term swings as shown in the chart below.
Note that you should tune the length based on the instrument you are trading.
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