Your Mazda MX-5 Miata's speedometer helps to tell you your precise speed. But over time, your speedometer could become faulty, which could become a safety issue! The speedometer works through the speedometer cable which is powered by the drive shaft. The drive shaft turns a magnet which creates an electrical current to send the information to your MX-5's computer. It will then calculate your vehicle's speed and send this information straight back through the cable to display the speed on your speedometer.
Speedometer cable relays your speed information to your speedometer
Faulty speedometers could become a safety issue
Common symptoms of a failing cable:
Speedometer needle wavers or moves erratically
Squealing noises behind your dashboard
Speedometer needle doesn't move
High quality, genuine Mazda MX-5 speedometer cable