i've got 63 NDX gaps of 2.5% or more over the past five years. averages about 1 a month, though they do seem to come in bunches. i looked at riding the breakout, no joy, by end of day you're as likely to lose money as make it, and it's split right down the middle, gains as big as losses and virtually equal numbers of each.
given that it should be no surprise that fading the breakout produced very similar results. i also looked for a limit that would consistently lock in a profit, couldn't find one big enough to bother with.
in a nutshell, based on historical precedents, tomorrow is a complete crapshoot.
now, the one potentially useful thing i didn't do was account for trend: fade the gap if it is counter, ride it if it is aligned. i will try to do that before crashing tonight.
EDIT: tried trading in alignment with trend, made no difference, still a total crapshoot.