Has anyone used a G-TECH/Pro Accelerometer or something similar on their ATV to measure HP, 0-60 & 1/4 times, speed, etc? www.gtechpro.com/

 

I wish that I still had mine to do so, but I sold it just a few months ago.

Also long as you didn't wheelie, it should work very well on an atv. It was dead on in my car and truck.

 

I've used them with my Muscle Car. They are a good gauge for comparison (between other vehicles using it). In regards of accuracy, I'd say they are fairly accurate. It should be mounted somewhere firmly with little vibration. Considering the fact it works via an accelerometer the less the vibration the more accurate it'll be.