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You must have a current relay that is activated by the current from the device you plug in (i.e. the sander)
The relay closes and the contacts energize the outlet for the shop vac.
Find the contact closure and wire the foot switch in parallel. Then either one will then turn on the shop vac.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
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