This is a replacement gear indicator needle for the instrument cluster in a 1973-1987 Chevy/GMC truck, and Blazer/Jimmy. It also works in the 1973-91 Suburbans. This is a common weak spot in these vehicles. I recommend printing this in PLA with a .2mm layer height, and thin walls.
The second picture is what I made this to replace
The author marked this model as their own original creation.