Speedometer issues

Inside the ALT' gauge there's a magnet also. Specs of iron, tiny flakes of chrome, hair, etc. collects on both.
A lot of my customer just want to get there gauges in their driver working again, so they send the fuel gauge alone.
Others who are restoring a car send the entire instrument cluster for services.
The main difference is how many times you'll R&R the instrument panel.
Good luck with it.