Your speedometer tells you how fast you are traveling. (the "mph thing")
Your odometer tells you how many miles you have driven. (the mileage thing)
No, it is not normal for either one to cease operating.
Check out your dealership for a replacement if you really need one that works.
Check out...
Different side for different years, so that won't help unless you know which side they put your year on. You VIN will tell you which engine you have.
Research which digit of your VIN indicates which engine was originally installed in the car.
Adam was created in God's image.
Cain, Able, and Seth were created in Adam's (fallen) image.
(Genesis 5)
The image man was designed for is triune, mind, body, and spirit.
Pray about it and you will find the image of the Trinity, if you are born again.