L_Simoes

hello everyone! I'd like a help from you. I have a yamaha dt125x and i'd like to change the speedometers. I'm interested in buying a digital speedometer but i don't know which one to buy (the specifications needed). Can anyone help me, and tell me what model fits this bike? it's really urgent. sorry if i can't explain myself but i'm portuguese, my english is not very good... thanks all of you