"66 6F HCS" <firstname.lastname@example.org> wrote in message
Just replaced my speedo cable and housing last week since the original had
rubbed against the headers and melted/frayed until the cable was exposed.
The new one was about 1' longer than the original and was bought at Napa.
The speedo bounced a lot at first even though the cable was lubed correctly.
Then a few days later, the speedo just kept turning around and around slowly
as I drove. Steady 3000rpm on my tach; flat highway, but the speedo slowly
turned continuously ALL the way around in a circle. When I stopped, the
speedo wouldn't go back to zero, it just stopped turning. WTF! Is my speedo
head hosed now? Do I go back to Napa and demand they rebuild or replace my
I called the ONLY speedo rebuilder here in Denver and they said that it
might be that the amount of cable sticking into the back of the speedo may
have been too long and gone too far into the head, thus destroying it. HUH??
They're quoting $130 to rebuild the speedo and ensure the cable is the
correct length. I also called Colorado Mustang who will sell me a good used
speedo for $75.
Hate to say this but I think the speedo shop is right. You pushed the driven
part into the housing and it's causing the magnetic to rub. That speedometer
works on eddy currents. A spinning magnetic "influences" an Aluminum disk
that drives the needle with a hairspring providing the resistance. In your
case the magnet actually rubs the disk.
Another thing, 1000 RPM equals 60 MPH on almost all cars with a old
Here are some articles to put you to sleep:)
Al # 35