basically first check your speed sensor it .5 volts a.c. then if that checks out good quick and easy way is to run a wire from your cluster which on mine were the yellow and yellow black wires (im pretty sure) accelrate and see if your speedo works.. then eleiminate a wire to see which on has a break/open in it.
if you need more help email me i can scan the photo of the wiring diagram for you i have the fsm from work
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