Did you buy a new one or just get one from a junk yard?
Do yourself a favor and bust out your multimeter. Backprobe the signal wire while spinning the wheel by hand. You should see a voltage change of 0 to .5V.
If thats fine youve got a wiring or ECU problem. Check the line for any voltage loss and if there is one trace it back.
This is a good time for you to have friends with the same car. Borrow a gauge cluster and and an ECU. Swap one at a time and see if theres any change.
By the way what have you done to your car? Any modifications?