There is no magical indicator for perfect buy & sell signals. You have to do your own analysis on the charts looking at Support & Resistance levels, as well as using several built-in / add-on indicators.
Almost indicator for buy or sell signal is not so good for accuracy, yaaa sometimes they're work when market is good, but later day the indicator can be not working good..... perhaps some EA can help you out to open trade also!! But still you need to know first about technical analysis, price action and chart pattern before you enter the real trading!! But before that you can learning first using demo mode..
I like the indicator for the Metatrader 4 platform called Nexus 6.0 from the SS7 trader - it gives pretty accurate signals about where the price will go.