For looks I have a cheap mechanical one that sorta works +/- 5mph. If I actually want to know how fast I'm going I zip tie my GPS to the handle bars for an accurate reading. I was alway told that the CDI on our bikes would interfear with the standard bike computer but it sounds like you guys are having success with them...Kelly

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I'm racin' Spitfire, turnin', poppin' wheelies, burnin' evil chasin' pop,pop, pop,pop,pop.... (The Pixies-Tony's theme)