I have 3 wireless digital signal VDO computers on three 'bents. Digital computers have longer effective signal ranges than analog.
(C2DS and C3DS) Not sure how available those are. More current model:
http://www.amazon.com/VDO-X3DW-Wirel.../dp/B0021QIYB8
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer