autometer speedo hook up help

can someone tell me what speedo cable i need to hook up my th350 transmission to an autometer mechanical speedometer? I just got one from autozone that wont work. I need one that threads onto the speedometer the one i just got doesnt have threads. and Autometer was zero help.

I have th400 and auto meter mech. spedo in my truck. I got a universal spedo cable from lokar and it was very easy to install. I bought it from summit for about 50 bucks.

thanks. anybody know if i can get an off the shelf one that will work?

went back and tried autozone again. i found one that will work. Pioneer model # ca-3004