That's not really hard coded. I look for S/D levels and thus for the big picture, the higher the TF the more reliable. And then scale down to where I want to scalp.
The US30 had a confident upward move since Dec12 as pretty well documented on the 1H chart. Thus, I've been trading off the Vidya Zone every time it got hit by a retracement. No rocket science behind that. If you are confident with what you are doing and the results are green, stick to it.


For scalping on very short TFs the M30 also provides a good indication. Pretty smooth in this case.
If you like you can add the Vidya Zone with the same setting but "2TFs higher". You might find that beneficial to decision making.