Setcom RC-18MU4K 18 ft. Radio Interface Cable
The Setcom RC-18MU4K 18' Radio Interface Cable is the radio interface for the 26-pin accessory port connector on the remote head or RF deck (dash-mount) and the IM-950 Master Station. It is compatible with Motorola APX 8500, APX 7400, APX 6500, APX 4500, XTL 5000, XTL 2500, and XTL 1500.
It includes an 18-foot interface cable. The radio programming determines the functionality of the ignition sense wire, and the external speaker can be attached to the 2-pin female connector.
It is covered by a 12-month warranty from Setcom.
You can download the interface instructions, here.