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Cramer usually scoffs at technical analysis and its accompanying stocks charts. In fact, he likened the practice to astrology during this week’s Game Plan. He just can’t get with the idea that because some graph says a stock will drop, it will.

But admittedly there is one tool of technical analysis that hasn’t failed Cramer, he said, since 1987. The Standard & Poor’s Oscillator. It measures the amount of stock buying relative to selling in the market.

When the buying and selling are about the same, the oscillator reads zero. Multiple days of buying, though, push the oscillator up. It signals that stocks are out of equilibrium. Over the past three years, any time the oscillator hit +5 it’s been a sign that profits should be taken, because some kind of decline is inevitable.

The reverse is also true. Overselling sends the oscillator down. No matter what the market has looked like, Cramer has always bought stocks when the oscillator’s dropped to –5, he said, because that dip has been followed by a rebound.

Well, Friday morning the S&P Oscillator hit –6.

“There has been no time in the last three years – not once – that we didn’t have a huge rally after this oscillator has fallen to these levels,” Cramer said. “Very simply, I believe that means it’s time to buy.”

The banks are likely to rally, he said, specifically mentioning Wells Fargo [WFC  Loading...      ()   ] and JPMorgan Chase [JPM  Loading...      ()   ]. Lehman Brothers [LEH  Loading...      ()   ], though, should not be bought.

Some tech stocks should move. Cramer said he likes Research in Motion [RIMM  Loading...      ()   ], Salesforce.com [CRM  Loading...      ()   ], Hewlett-Packard [HPQ  Loading...      ()   ], Google [GOOG  Loading...      ()   ] and IBM [IBM  Loading...      ()   ].

Ingersoll-Rand [IR  Loading...      ()   ], Emerson Electric [EMR  Loading...      ()   ] and Parker Hannifin [PH  Loading...      ()   ] are new-tech names worth owning. L-3 Communications [LLL  Loading...      ()   ] in defense got the nod as well.

Even the housing stocks could earn a profit, Cramer said. Owens-Corning [OC  Loading...      ()   ] and Toll Brothers [TOL  Loading...      ()   ] stand out. In retail, Costco [COST  Loading...      ()   ], Wal-Mart [WMT  Loading...      ()   ] and Jones Apparel [JNY  Loading...      (