Outer Limits 4x4 Board

After driving home from work yesterday i noticed my speedo is jumping around like when the cable is about to snap on a old style cable driven speedo setup.

But aren't these electronic???

What could be the problem and how much do you guys think it's gonna cost me.

Yes, definately electronic.

Hopefully a wiring / connector issue, but it could be the sender unit itself. Check the wiring and connector to the sender on the rear of the transfer case.

Forgot to mention

Fine up to 50km/h then it starts dancing.

Thanks for the tip i'll check it the sarvo.