Ive ran the Ecm wires several different ways. I Don't like using bulkhead only because that's just another place where there might be a "bad connection" It just like plumbing.. the more joints you use the more chances for leaks. I have ran the harness through the area just under the blower motor and through the kick panel. The other would be through the trans tunnel. I usually modify the arch of the tunnel so there is clearance. Sometimes the connectors are too large to go through a 1" hole. In the past I have made 2 plates with 2 half circles cut out. Once the plates are together around the harness you can install a 1" grommet.
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