That 8K is interesting - Doesn’t look like a reproduction to me based on the colors - I would have to see the back , is there any numbers Chrysler on the back
I have never seen a factory 8K in a 1971 B Body that I can remember , it would definitely bee early production
However I have seen 1971 B Body Factory Brochures , Chargers , Roadrunners , GTX , within some of the interior pictures you can definitely see a 8K Tachometer in those brochures
I sold some pretty nice 7K on EBay some years ago for the price range of around $200.00/$300.00 - In working condition
There is definitely a demand for them because most vendors are selling them within a complete cluster assembly , and that of course is based on condition of the complete set up
Shoot me some prices if your interested in selling thru private or at least let me know if you decide to sell or list
Thanx