Here is a 2-man team radio set. Bought new in 1990, used very little. Batteries for the P-50 radios still available from Racing Electronics or EBAY. It cost new $1,700. Will take 1/2 price. This kit has all you need for the driver, car, and one pit crew member.
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I also have a 3 man team, Same as above but for the driver and 2 crew members. Asking $1100
thanks for your interest