Speedometer gear (and odometer) is not working properly

Being it is an electronic speedometer the easy way to determine if it is sensor or a bad servo in the cluster would be to put a scan tool on the car that can read live data. Then compare the readings from the sensor to the speedometer. You may also want to compare the odometer readings to actual driving distance. It is driven by the same sensor but through a different circuit in the speedometer head. If you drive 10 km and it reads 10 km the signal to the speedometer/odometer head is okay and it is a faulty speedometer head.

Hello,

I connected a data-logger to the car and indeed the sensor is outputting correct readings from the drive-train. I also realized the tachometer and odometer are off, so I think it may be a problem of the entire cluster.
Thinking about it, I did change all the bulbs in the cluster to blueish LED's, maybe that had something to do with the overall malfunction? Perhaps an excessive drainage of the power supplied to the cluster that affects the operations of the remaining cluster components? However, LED's drain less than older bulbs. Ah! got to find a replacement cluster and test it out. :)

Thank you guys.

I doubt the LED's are the issue. However, it is possible that the removal and replacement of the cluster did disturb the connections, especially a ground. If the ground connection was corroded or higher resistance it could cause odd behavior due to the voltage being incorrect to the cluster.