[mrbbody]

Some floor dimmer switch will work since it most probable be functioning a relay anyway. You need to redirect the wires that go to the present dimmer switch and connect them to the new. To do any of this you need to get a color wiring diagram and figure it out, something like this.

3-way dimmer switch wiring diagram

You also need to get underneath the car to observe the proposed spot is clear. You will need a body punch to make the hole or else a drill and ream it out. Plus mounting holes.

Good Luck!

i dont think you should use a house wire diagram for a car