I haven't done this, but plan to. One example shows a knob for a potentiometer that would let you set the idle speed. There's also a document around here on the forum (look for Q-256) that has the resistor codes needed for various static idle speeds. In this case the switch is one of the upfitter switches. If you don't have the upfitter switches, relays, wiring, there IS a full Ford SEIC module with switches and display.
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