1989 F150 4.9What if the speedometer does not work and you have replaced the speed sensor and checked fuses Any suggstions?
if i remember correctly they did not start using an electronic
speedometer in f150's till 1992 so your vehicle should still have a
mechanical speedometer which has a cable ran down to your
transmission. the sensor on the rear differential on those models
is an abs sensor on 92 and later its the abs and speed sensor.