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Old 09-20-2016, 01:51 PM   #4
apbright
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Location: San Francisco, CA
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Default Re: Photo from Classified Ad

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Indeed, the second line (the one nearest to the driver) would possibly be for either a vacuum gauge, or for an accessory, e.g. a vacuum-powered fan, like one of these:

http://www.ebay.com/itm/30s-40s-VINT...9SzDXQ&vxp=mtr
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