hi,
I just repaired my 2000 sportsman 500 today.

it had the NO LIGHTS, NO SPEED (needle), NO HOURS (digital), and NO MILEAGE (digital)issue.

The speedometer head comes apart by gently bending the metal brezel up, then the needle pulls straight up (note where you have it positioned)

there are 3 screws under the numbers, you need to peel the plastic label up carefully.

from there the back has 2 large black electrolitic capacitors and a 3 legged SRC transistor next to them. That transistor part needs replaced.
It is a Motorola TIP 48 voltage regulator.

Mine looked fine visuially and after much convincing I pulled it and replaced it and saved my self$ 250.00

need more help--email me at Apark3@woh.rr.com
I have a bunch of these transistors, had to buy 50.