Just RSI utilised well can give such powerful signal.

• The chart included in this post or idea, is a Nifty 2 hours chart, and a 21 period RSI with 9 periods EMA.
  
  As you can see this chart has indicated weakness on Sep. 26th, at about 11:15 A.M., when Nifty was at 11560.
  
  Ever since, it the EMA line has gone above RSI, it has never been able to surpass it, as you know this confirms the continuation of weakness or selling pressure on this index.
  
  Looking at how the RSI and this EMA lines are moving in tandem, I feel, this simple setup may provide a perfect "signal of reversal" whenever it happens.
  
  Readers may wait for RSI to cross EMA line on a two hour closing basis, before taking any fresh long position in Nifty.
  
  Simple technical analysis used with discipline and patience work wonders.
  

Trade closed: target reached:

The EMA over RSI worked well, gave a perfect reversal signal, that too well in time.