those speedometers are known to go bad. let me ask you a question does your 4x4 work? the 4x4 runs through the speedometer and if the speedometer is truly not working the 4x4 is usually not working either . I'm not saying thats it for sure it could be a bad sensor or a bad wire connection.
I just replaced mine on my 99 xplorer (same part #) I bought mine from DirtCheapATVParts.com best price hands down. I looked for a long time. and evan bought a bad replacement (manufacturer date was in 2002) but when I bought this last one it was made in july of 2010. works great.
o ya I should add that yes they electrical (not cable driven)
part # is 3280363
the same speedometer fits all of thease
# 00-02 sportsman 6x6, 99-02 sportsman 500, 01-02 sportsman 400,
# 99-01 magnum 500, 00 sportsman 335, 99-00 xplorer 400.
2010 Sportsman 550XP
1999 Xplorer 400
Last edited by thepopeis1; 08-08-2010 at 06:30 PM.