Where can one dig up the wiring colors/part lists/schematics for the cruise control on later 240's? I understand that the latest ones had been prewired and just needed the control module and the vacuum modulator to work, but what about a 1988 DL? Want to add cruise to it but not sure what the entire list of parts should be for scavanging from a junker. I've tried to find a schematic of the system, but none of the books I've come across have it listed. They just state "take it to a professional" and won't even go near it. Advice?

Thanks!
Masscnfusn