[SuperNovaSS]

I was wondering if anyone can help me with identifying this tach. It was found in a defaulted storage locker that as sold at auction. It is a 66 fullsize Chevrolet tach for the L72 427/425HP. The 427/425HP engine could come with a points or Transistorized ignition system. I believe the points and TI system used a different tach. I would like to know whether this tach is for transistorized ignition, points, or both. The GM part number is on the back but the last number is very hard to make out. The first 6 numbers are definitely 641254. The last number looks like it could be a 3 or a 9 but could also be something else. Can anyone help?


Thanks,

Jason