has anyone had any luck in extending the wiring on a shimano flightdeck (or other computer, for that matter) that is meant to go on the front wheel so that you can actually take readings off the back wheel? i'm looking to get info when my bike is on the trainer, and want to avoid having to buy and run a new computer when the flightdeck works great when i'm riding.

any other ideas, if you have them, would be great.

thx in advance

matt