On the 55-59 speedo, the needle just pulls off the shaft, but you must
be careful so you don't break stuff. I think there may be a special
tool for doing this...but you may be able to carefully pry it from the
bottom end (towards the mechanism).
Sometimes the odometer gets stuck, and the speedo will bounce because of
the stripped odometer gear that results...this may be your problem.
I've been able to use the guts from 60s vintage GM cars in TF speedos,
but it takes some messing around to make it work. I've also used the
odometers from 70s vintage GM cars to just replace the odometer. The
newer odometers were plastic instead of aluminum...so they didn't use
grease like the older ones, and thus wouldn't get stuck because of hard
grease.
A drop of oil on the speedo, at the bushing where the cable goes into
it, can do wonders to make an old worn speedo behave for many thousands
of miles.
It also helps if you have a collection of old speedos to experiment
with.
Jim
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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