unscrew it from the speedometer head under the dash and unscrew it from the tranny and pull the old one out and install the new cable.
In most 1962 Chevys, the instrument cluster is screwed in from the front. After removing the screws wiggle gently and look to see if any wires or the speedometer cable needs to be unhooked.
It unbolts on the outside of the firewall and comes out inside the car on passenger side up under the dash.
chevy impala
1962
I checked my 1962 owners manual and there is no reference to towing.
A 1962 lowrider impala
1961 or 1962
1962
In 1962 there were only 1,206 Bubble Tops produced
cowl tag
209.6 inches.
The maximum speed of a 1962 Chevrolet Chevy 300 automatic 6cyl 120HP is /was 80 mph or 128.74.