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I just installed a SS dash in my 1970 Chevelle SS clone. The car has a MSD ignition system. My question is which terminal, (+ or -) does the stock tach lead go to? I had an aftermarket tach before and I had to run it to the positive terminal in order for it to work. I just don't want to burn up a $200 component.

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1968 Camaro RS
1972 Chevelle SS clone
 

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Not a MSD expert but thought that box had a separate output for the tach. MSD has instructions here:
Click on www.msdignition.com
Go to INSTRUCTION DOWNLOAD
Click on that
Click on MSD 6 SERIES
Download that file.
 

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Just installed msd 6al on my chevelle and it does have a seperate tach plug.Best to get the instructions because it depends a lot on the type of distributor you have.

Bobby
 
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