I’m installing the tachometer harness in my 66 Chevelle.  The brown coil wire is supposed to go through the firewall and has a rubber boot to seal the connection.  The assembly manual shows that a 0.500 hole should be drilled at the firewall at an existing dimple.  It shows the hole near the firewall wire gutter.  Does anyone have a close-up photo showing precisely where this hole should be drilled?  There are numerous dimples on my firewall at this location. If someone could help me out with a little more precision I would be grateful.  Since this involves drilling a hole in the firewall I want to make sure I get it right on the first try!  Thanks.

 

Rob S.

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