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Been a while since I have looked at the cruise on a 240... I have seen several configurations and types.
I think you would at least need to grab the CC control unit (ususally under driver's side dash), CC wiring harness, associated vacuum tubing, the stalk that the swithes are mounted on (turn signal or wiper stalk), the CC "kill" switch on the brake pedal (separate from brake light switch- may be vacuum valve) The vacuum actuator and cable assembly going to the acellerator or throttle body. From what I remember, on mine it was a cable running from a vacuum device under the dash to the acellerator pedal. On some it may be electric and/or under the hood (not connected to the pedal). Basically you will have to trace compnents from the CC control unit to be sure.
Also you will have to note all the electrical and vacuum connections. Some can be tricky, like the connection to the back of the instrument panel. Also there is a back up to the CC "kill" switch on the brake pedal. It is usually a wire that goes to the brake light switch. I am not cetrain how many revisions or models of cruise control there are and model year compatibility.
Provided that you find a workable/compatible unit, it should not be an insane task. Just kinda hard working under the dash on the driver's side. Also you have to be very careful about aligning the cruise cable to the accellerator. If not centered dead on for a straight pull, the cable will rub and frey. You'll have to buy a new cable every 6 mo, if this isn't right.
All said and done you can probably do it in 2 hours. I think the dealerships would add it in the form of a kit, if a customer requested.
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