[YENKO DEUCE REGISTRY]

That's what C-Joe is saying, the Pontiac tach is a GM piece not a Dixco item. The design, shape, wiring, etc.. is completely different between the two. The Dixco unit was an aftermarket item that was included in the parts catalogs of some mfg's like Mopar and Ford, and some dealers like Yenko, etc.. and some retailers like JC Penney, JC Whitney etc...