speedometer problem
 

i searched for forums for about 15 min and couldnt find wat i was looking for.. so here it is...

my speedomter still works ( tells me im moving, going faster ) but the rate that it does it at is not very proportional... like it says im going 60 when i shift to 2nd.. hahaha.

anybody know wats wrong? or how to fix it?

i figured id ask the experts before some kid in a shop messes with it.