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Re: Clean way to route wires through firewall?
Get a nice piece of 18ga stainless steel large enough to cover the hole. If you can access under the dash weld a pair of studs to the backside of the stainless so it's nice and clean on the front. Drill the appropriate size hole in the stainless for a grommet to pass the wires through. Polish the stainless or paint if you prefer, make a gasket or glob some sealer on the back of it and mount. Hole filled and wires run through stock location for no issues with the harness.
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