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Old 04-07-2012, 09:24 AM   #1
craig32
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Join Date: Apr 2011
Location: PA
Posts: 56
What is the thing behind the speedo??

Greetings! I just bought another gauge set for my 56 (from a 59), and when I got it there was some sort of gadget screwed on to the back of the speedo and the cable screws into it. It has a vacuum line coming out of it. Any idea what this thing is?
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