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Re: 79 Tach Harness Routing
Attached is a pic (I think it may have been from this site) that I saved years ago showing the factory tach wire going through the firewall on a 78. It's the brown wire just below the lower / right corner of the fuse box. GM changed this over to a white wire sometime around 79. I believe there will be a dimple stamped into most firewalls in this location.
As for the routing along the firewall to the distributor, I simply ran the tach wire along side the engine harness when I added a factory tach to Dad's 77. I'm not sure if that's exactly how they were originally routed though.
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