What you don't see of course are the special technical studies I have developed over the years expressly for spread market entry signals. I also work in multiple timeframes.
Here is an update re: my live Wheat March12-July12 Calendar Spread. The blue crossover is the entry point, the green horizontal line is the profit target, and the red horizontal line is the stop-loss level.
My apologies in advance for leaving out the spread-specific technical studies working in multiple timeframes.