ON/OFF switch location on 66 Dart

As some of you know I,m turning my 66 Dart into a bracket racer.My problem is a location for my ON/OFF switch.Oh,the car will still be driven on the street but minimal,so the tail light is a no go.So do I cut a hole in my bumper?,or remove a reverse light lense?Any help would be appreaciated with pics.Thanks.

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