72 Dart Swinger 3.6L Pentastar +T5

75slant6 said

How many wires are in that harness? A bulkhead connector would give it a more factory appearance.

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Cut a piece of sheetmetal plate to fit over the square hole and rivet it in place. Then cut a circular hole in the center of the sheetmetal plate for a large rubber grommet to fit.