i dont know if the fiesta mk6 speedo is electric or mechanical, but if were mechanical, it would either be a bad speedo cable, a bad speedo, or a bad gearbox. if it were electrical, i would think that again it could be the speedo, or it could be the wiring, the sensor, or a computer if there is one
the LACK of LUBE or Graphte on the speed0 cable IF it's not an electric sending unit type. The speedo cable spins inside another cable. Moisture will cause rust after a few years and this will cause the speedo cable to start to drag and release. If you remove the cable from the back of the instrument cluster and squirt in some graphite, this should help with the bouncing.
If it is a cable driven system, usually a jerky needle is caused by a dry cable, either replace or lube the cable as it is getting stuck and stopping for a second then getting unstuck and jumping back to current speed. If it is an electronic speedo then it could be a loose connection under the car, usually they tie into the transmission to get speed input. Or could be as worse as a faulty speedo in the dash.
There is a separate motor that runs the odometer. It is not running for some reasson. TAke it to a speedo shop.
When getting a tatoo, the skin is opened by the needle , a scab forms as it would if you cut yourself.
That would all depend on the size and the intricacy of what you are doing.
there should be a electronic plug on your gearbox, unplug that and screw out the sensor, but make sure its not the reverse sensor, if its the st or sport then its the abs sensor but that wil make you dash lights come on and show no milleage
If the speedo stops also, it is the speed sensor. If just the odometer, take it to a speedo shop.
If it's an electronic (analog) speedometer needle, you probably have a problem with the dasboard grounding.
If your car has a manual speedo, it can be in it or the cable. Noises have to be heard to be correctly diagnoised.
Acceleration is not represented on a speedometer, however, when you look at the speedo, if the needle is moving, you can get a rough idea of acceleration like this: If the needle is going clockwise (of generally indicating faster speeds) - you are accelerating. If the needle is going anticlockwise - you are decelerating. Speedometers measure speed. You would need an accelerometer to measure acceleration.
chicken pocks!
The speedo or the speedo cable might be broken and, or be dissconncted.
i would tell you but its agenst the law so then how do you re-connect the speedo
Buildup of gum and/or varnish or foreign contaminants.
Stuck floats or dirty needle valve.
Check: Cable to trany, gear in trany, speedo head in cluster
Needs lubrication, use only speedo lube from parts house, not motor oil, it is special oil, ask for it.