That's a non-PD.Had the same bike/year for 17 years then bought another one as a project last year. 4 screws in the back of the headlight/speedo holder and the front cover/windscreen will all come out together. You'll need a long Phillips screwdriver to get at them, they are quite recessed in the back. Preferably a magnetized screwdriver or be careful the screws don't fall out and disappear.
When you are in there...inspect the wiring loom coming out of the housing toward the frame, well known problem with them the casing cracking and then later the wires breaking.
Need parts....pics? Near new speedo in MPH? I have one of them bikes in pieces in Canada, not worth the expensive full rebuilt it needs so may go on Fleabay eventually.