The Selector Switch
The dial going clockwise:
Stock, Low, Medium, High
Plug white connection from switch into the white port off of the module's harness. The switch must remain plugged in to remain in desired setting. You can run the switch into the cab or leave tied up under the hood.
The jumper plug is used to hold the module in one setting so that the switch can be removed and does not need to be connected. It is personal preference and we offer it as an option per the request of our customers.
The plug will hold the highest setting in the module. Keep the switch in your glove compartment or center console as needed while using the jumper plug.