Remember it has a built in mercury switch turns on/off automatically as you raise/lower the hood.
BTW a bit of trivia, not too sure on 55/56 trunk lids defintely on 57 but next time you lift your trunk you`ll notice what looks like a drilled hole on the inner linning on the drivers side. That hole is to mount another accessory a trunk light that comes on when you turn the park lights on & works the same as the hood light mercury switch.
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