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The speed sensor is located on the transmission output . I don't think the problem is in the dash. Go to YouTube and type in where is the speed sensor on a 1991 subaru legacy and it will bring up all related videos. Hope you find this useful.
The first thing you can always do is check your fuses. there might a blown fuse that need replacement.The 1990 Legacy has a mechanical speedometer . The speed sensor is a read switch in the speedometer head itself. So
if your speedometer is functioning ( needle working properly ) then the
internal read switch is defective. That requires replacing the entire
speedometer OR it can be a defective connection between the speedometer and the
ECU.If the speedometer is not working, then you can
have a defective speedometer, cable, speedometer cable adapter ( on the tranny
) or internal speedo gear in the tranny.Thanks. you can rate this solution and show your appreciation.