Check the fuse. Re-check all wires. Maybe you left something off (ground link?) or they're not connected well. Pull them apart and try it again. Also, is it possible you got the wrong sensor? Check the number. Did you work on anything else at the same time? If so, check all the wiring around that too. Hope that helps.
go on you tube it will give you the answer faulty scorpio speedo
On a 1989, the speedometer signal comes from the sensor in the housing where the passenger side axle shaft goes in the transmission.
Speed sensor
There is no speedometer cable. MPH is calibrated using a speed sensor. If your speedometer is not working, you have a bad speed sensor module.
The speed sensor is located in the speedometer assembly, at the back of where the speedometer needle connects.
The vehicle speed sensor which is an integral part of the speedometer
controls speedometer
the speed sensor, trans. sensor , or the speedometer cable
The transmission computer takes the output speed sensor signal and sends it to the cluster for the speedometer reading. The output speed sensor is a likely cause.The transmission computer takes the output speed sensor signal and sends it to the cluster for the speedometer reading. The output speed sensor is a likely cause.
It has a Speed sensor.
I'm pretty sure the speedometer uses the transmission speed sensor. the rear axle speed sensor is for the rear antilock brakes.
The axle speed sensor measures the axle speed for ABS functions and for the speedometer.