since the ozark atv from suzuki comes without a speedometer, i found that a bicycle speedometer called the sigma 800 works well and is easy to install. it costs about 25 bucks. let me know if anyone needs more info.

 

Where did you mount the pickup and magnet? I'm interested in any info you can send.

 

go to radio shack and get some flat magnets
mounted sensor on the round plate that protects the brakes
use cold steel to stick magnet to inside of wheel rim
before you stick the magnet, make sure it will come no more than 5mm from sensor when the wheel spins

i drilled a couple of small holes in the plate and mounted the sensor with 2 small screws. also if you might need more than one magnet on top of the other to get the gap to 5mm or less

so far it has been very reliable, good luck

 

this may be a little out dated but can you tell me where u got the speedometer. Also does going throught mud etc mess it up.