Speedo works backwards

[edhd58]

speedo show forward speed only in reverse, and bottoms out in forward gears. i just now got the speedo cable installed for the 1st time since ive owned the car. its a 42 fordor with a 47 rear end. the turtle will only mount in one direction and allow me to install the cable. if i install it reversed to how it is now I have to cut a hole in the frame.


will reversing the way the turtle mounts make the speedo work correctly?