Jason,
That is a transistorized tach that was offered late in the '62 production year (no sender). The part still doesn't show up in a June '62 revised parts book, and it's not carried over to the '63 book. It had a very short lifespan. The redline indicates it's for a 327. I know the part is legit ('62) although I've never documented an original car that had one installed at the assembly plant.
Hope this helps.
Verne
