I think mine is behind the instrument cluster; sitting in the driver's seat, it would be to the back left toward the windshield behind the cluster. Need to remove the back cover of the instrument cluster to see it. Access is from the top of the dash once the back cover is removed. Has a wire for an antenna.
Had the cover off the other day to replace the monitor; noticed it by the wire antenna extending from it.
'07 Winnebago Journey 34H - CAT C7, Koni's, MCU's, SS Bell Crank, Safe-T-Plus
'07 HHR Toad, SMI AFO, Blue OX