Man thats a tough thing to do......the way most works is you tap the button and it cranks it over until it senses the engine reving up (from a tach input) and it doesn't start it will quit after so long. Making the circuit would be a pain in the ass, making a circuit where you hold the button is easy, but can have bad effects on your starting system plus if you where that close to here it running you might as well just turn the key. Buying a kit and having a place like circuit city install it is definately worth the money.
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