I have found this strategy to find possible gap ups.
set up
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On Hourly Chart
Plot EMA 200 ( in the above chart it is blue solid line )
Add VWAP , set weekly setting
Add EMA , set period to 9
Change the source of EMA 9 to VWAP
Lets call this ema9 setup as EMA9VW (in the above chart it is purple line)
BUY
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EMA9VW is above ...