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Replace Parking Brake Switch

I have a 1999 D3C and need to replace pressure switch mounted on the parking brake housing which is sandwiched between the drive motor and final drive.  A mischievous rodent chewed off the wires right next to the pressure switch body so no repair is possible.  What precaution do I need to take before I unscrew the old switch and attach the new switch.  Thank you advance for your support.