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Another great idea, which box are you running and where does it plug in? I see a plug port on the side of my 6A box put not sure what it is for.
Using the MSD 6A box. The port you see opposite the wires side is the tach port.
I have the box mounted on the aft side of the passenger fenderwell near the vents. The tach wire is there permanantly, routed up just below the hood seal. So whenever I decide to use it, there's no reaching and groping for the port connection. I just attach the spade connections and go. :)