Speedometer Not Working But RPM Works - Causes & How to Fix?

Our speedometers are something we take for granted until they break down and we are unable to determine our actual speed. Although fixing them yourself seems difficult, there are some straightforward solutions.
You will gain a better understanding of speedometer operation, common causes of failure, and repair costs by watching this video.

Timecode:
00:00:00 - Short intro
00:00:20 - Types of Speedometer
00:01:22 - Reasons Your Speedometer Doesn’t Work
00:01:39 - How to Fix
00:03:07 - Can You Still Drive Your Car If the Speedometer Doesn’t Work?
00:03:34 - Cost to Fix

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[edwinalexander]

When the Maximum speed on the speedometer is 180mph, and when driving the car it goes into limp mode at 80mph and the speed doesn't exceed 80mph. what can be the problem?