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1967 Olds Toronado vacuum headlight door control

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Need info on  how vacuum system works ? i do not have a correct vacuum switch ,so using toggle style air  off and on valves too control doors and locking dog release.does  the vacuum pots require constant  vacuum source or can the vacuum be held in (close the valve)   to keep door closed? when i release the vacuum the doors open  and the  locking dog  kicks in  and has to be vacuum released to close the door

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