The chart uses my two favorite indicators; and .
I've gone through and marked historical correlations on the chart for prior crashes for both indicators.
going above 70; signals overvalued
going below 30; signals underbought
You'll see both of these correlate quite nicely with the two previous crashes.
I project a between a 30-40 percent pull back spanning nearly two years.
I've added a possible short position with a fairly tight tolerance for a good ratio.
I'll keep the chart updated in case we're looking at a false-top; given present valuations and P/E ratios I don't think we are.