ABS/Speedometer Issue

[dac44444]

Does your speedometer work?

Yes.

 

[GunnerSchenck]

If you'd have said no I'd have bet on the wiring above the rear axle and parking brake to the rear sensor..
But it's good that you have one.
The first thing I would do in that case then is run the abs codes with a code reader with abs function, or a scanner.
That way you won't end up putting more sensors on that you don't need, or a pump that isn't needed..