similiar issue....VDO wireless computer and dinotte 200l. i had the lights out ahead of the computer and as soon as i turned them on the speed reading went to 60mph. after some fiddling i mounted the light right to the handlebar on the opposite side of the stem and no problems! light was previously on one of those FSA computer mount extendo thingys.....so far so good
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Mistakes are just fine. Just don't make excuses....