I bought a new wiring harness from YO for my 67 GTX Hemi car and the oil pressure switch wire was in the wrong location and the tach wire was the wrong color.

I called M&H and they said to just send them my old harness and the new harness and they would make the new one match the old one.

Research revealed that it appears the factory blueprint for the 67 Hemi "B" body Plymouth is incorrect and possibly someone tried to integrate later wiring for an in-dash tach into the 67 Hemi harness.

They were great folks to deal with and they asked if I would pay shiping both ways. This was a small price to pay for the service provided.