This should also work for the Honda CX500 as it uses the same units as well as the early Goldwings and 70's through early 80's CB series bikes with the same style tachometer and speedometers.
Step 1: What you need
- Tachometer or speedometer that you want to take apart for some reason
- 1/4" flat bladed screw driver with a tip that comes to a fairly fine point as it will have to get under the edge of the retaining ring to pry it up
- and a pair of pliers