both the speed sensor and ignitor r fine. ive replaced both. this problem has been going on for a few yrs. the randomly jumping guages. i took it to a dealer last may. they found nothing wrong, told me it was the speedo/tach heads. then told me $1100 to replace them. i said no thanks.

i dont get any cel or flashing D4 light. the odometer and trip odometer stopped. infact when it would jump the odometers continued to move. dead now. shifts fine. i know the speedsensor is working i passed one of those police speed boxes on the road it showed up. so its the cluster for me. could just be loose plugs or the circuit board could be gettin old. they use to jump when id use the turn signals but even that isnt every time.