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Factory ZL2 Camaros also had a wire hole stamped just above the main wire harness fuse panel junction box, on the firewall.
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The 3/4 inch hole above the fuse panel junction box hole is for the ducted hood wiring. The 1/2 inch hole below is for tach wiring.
Pic:
http://s74.photobucket.com/albums/i2...cktachhood.jpg