[not a charger]

When I purchased my 78 TA, the owner gave me this 160mph speedo in case I wanted to install it. I know these are available reproduction. The part # 6492882 W is on the back, and I know that coincides with the reproductions. However, there's also a stamp that says Feb2 1971. It this a genuine GM part? Odomert reads 63,394.0, which leads me to believe that it could be. Thank you for any help you can provide.

[Transamric]

Looks like the genuine GM item to me.

[Aus78Formula]

The repros are so good they even add date codes and miles

[unruhjonny]

that's an original speedo all right.
That speedometer is from a 1971 model year car to be precise.

The speedo to swap in your 78 TA is the 1972.5-1974 speedo - not the 1970-1972.5 speedo;
Midway through the 1972 model year the seat belt warning system was added - this changed the speedo face - where it used to only have a (parking) brake warning at the bottom of the speedo, it now had both a (parking) brake & seat belt lights.

Here is a (faded) 1975-1978 speedo:


Here is a 1972.5-1974 speedo:


(these are not exactly the best pictures, but I tried to find two similar sized images which showed the speedo face with the brake & seat belt warning light spots.)

I hope this helps!