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unscrew the cable from the transmission. if you can`t unscrew it,unbolt the lock bolt that holds the little bar which keeps the speedometer cable in place and remove the speedometer driven gear assembly from the transmission. the gear is plastic and is what the cable is driven by.
Headlight knobs are attached to a long stem into rueastat switch (dash light dimmer ) push the small button spring loaded of headlight switch behind dash panel. Knob with stem will come out. Careful not to turn on headlights & run battery dead. Wiper knob has a release tang behind knob push up tang with a small screw driver ( pocket type flat ) or look for a small set screw on knob Speedometer cable may be broken,loose from dashboard connection,loose from transmission or broken cable gear in trans. Not sure when ford swicthed to magnetic sensors. Possible lost pick up sensor on drive shaft
where the speedometer cable goes into the transmission under the car, when removed from the trans there is a small gear that gets worn out over time.. that little gear or the entire speedometer cable needs to be replaced. An easy and inexpensive fix. I believe the ABS light is on because the computer needs the speed of the car to make its calculations for braking. As long as the speedometer is not working, it cannot do that. So after the speedometer cable issue is fixed, that issue should be fixed as well.
your spedo cable is probably just loose which can be fixed by tightening or replaceing. Might as well go ahead and replace it since its a 14 year old truck and its the more sure fire way to fix the bounce.