my speedo guage doesnt work..somtimes it will jump from 0-70 in 2 sec (while im at a light)...i swaped cluster, speed sensor, even did a motor swap and its still acting up..has anyone ever had this problem

 

Did you take the inside of the cluster apart?? If you did then, take it back apart and pull the speedo needle out VERY CAREFULLY and put the cluster back in the car with it out start the car up and CAREFULLY put the needle back on.

 

but i tested the cluster on another car and it works perfectly fine....