Where are you locatedIJ One place to look is if you have a sporting store that handles handheld GPS's, they should have someone on staff that can help. The Garmin 76map that I run for scouting, can be ordered with the lighter plug and nine pin combo wire harness. Then all you need is the nine pin on your yield monitor and possibly a null modem connector. Them make sure your GPS is set up the same way as your yield monitor (baud rate, hertz). And your off to the races. Dan