Skint buddy needs a really cheap one for his MEV Rocket. Any help appreciated

TECH TRIP COMPUTER CLOCKS CLOCK TRAIL DIGITAL SPEED READER SPEEDO SENSOR CABLE | eBay Possibility?

My local Lidl had some bike ones for under a tenner. Or speedview on here was offering his system at a discount for Locosters. Dunno if it any good
http://www.speedview.co/

Eta, found it! http://www.locostbuilders.co.uk/viewthread.php?tid=165360

[Edited on 20/6/12 by owelly]