Day Trading exit indicators are a form of trying to contraint the markets to a certain default setting. Try to get away from these ideas and focus on how you can have a high probability of correctly interpreting the market action through using charts, fundamentals, news, time and sales, order flow. Put all your considerations and focuses in learning to trade on understanding at any particular context or market why their could/would/will be more buyers than sellers.
A triangle may have a % probability of working but when you study the current context you can greatly increase your ability to interpret correct genuine breakouts that will be sustainable in long rallies or just false one...
Try to get onto the concepts i've described as quick as possible, any other behaviour simply hides from these realities which i feel in most traders cases must be eventually faced or some traders are simply conditioned from the beginning to consider such aspects important in developing a profitable consistancy.
Rather than let an indicator dictate when you exit, try to start 'reading' the market in whether your entry is in a sustained movement, small re-test or range fluctuation movements...
Then again, don't listen to me! I'm not trading today because i was so poor yesterday.