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Have you replaced the PMD (Pump mounted Driver) on your truck? Did you notice a decrease in power? If you did or if you are just looking for a inexpensive way to pep up your 6.5 GM diesel, this is what you need. This resistor sets the fuel and power level to the high side of parameters while no resistor sets it to the lowest parameters allowed. The resistor installs inside the pmd (inside the cable plug). Most people are not aware of this so new PMD's often get installed without a resistor.