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DFO Fuel Optimizer

hotrodjohn

Active Member
My buddy handed me a DFO (same as TFI) unit today and said give this thing a try. The only problem is it dosent have the plug and play harness just 4 wires,red black gray and blue. I assume the later goes to the injectors. I dont want to carp up the stock wiring but how does this thing hook up?
 
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