Does the track have a amb system? If so, it can be turned on for practice.

I have seen this used with a small netbook:
http://www.trackmateracing.com/shop/...id_category=10

Seen one of these also: http://rclapcounter.com/page1/page1.html

Both times a PVC bridge was used to house the wire, it was built with threaded couplers that he took apart and put in a bag.

A few friends to help split the costs would be nice.