Need Information on Speed Activated Spoiler
sprite63, I really apologize for putting my ideas before you've received an answer to your limit switch question.
Not the best answer, but I'd say hook it all up and see what happens. I'd mentioned that when I first hooked up the wires to the motor, I had them reversed. The motor sort of bumped and I quickly removed one of the wires.
I'm well aware power anything on a car shouldn't be assembled by trial and error, but perhaps in this case, that might be the best way to start - but always be prepared to cut the power. Many years ago I installed power windows in my '75 Alfetta GT. There were a lot of moving to Plan B's before it all came together - and fortunately I didn't burn anything out.
I don't mean to talk down to you but I'll just add this if it will help: Do use either momentary double pole double throw - or - single pole double throw. I don't mean to talk down to you but the momentary part is that the rocker or toggle switch has springs behind each position so that it reverts to the center once released. Single pole double throw is having one contact top and bottom and one in the middle. The double is having two sets of 3 contacts.