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Per the owner's manual, that is the correct operation. Which i never understood why you wouldn't automatically want the dash lights come on with the headlights.

So I wired my dash lights as such to come on directly with the headlights.

I used the now free position on the three-way under dash swtich to turn on my back-up light.

Also, I wired an aftermarket underdash light which comes on with the map light. Being a convertible with no dome light, this makes the interior way brighter when you need it.