The only single wires that connect to the cluster are the single green one we spoke about and a red and white one that goes to the tachometer. If both of these are plugged in then the cluster is covered. From the cluster on the 15 pin connector I believe that there is a green/brown that goes from the speed input to the cruise.

But in the wiring diagram the only thing that is close is a black and green wire that is a speaker connection.

But this would have nothing to do with your cruise.

As far as the Becker system I bought my 420 after someone already hacked the old system out and did a half a#% job of putting another mfg's system in. After hours of studying the wiring diagrams and carefully playing with 20 year old wire I finally got everything working again, even the electric antenna!

Sorry that I cannot be of much more help!

But what is the matter with the cruise?

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William
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1987 420 SEL - Like a fine wine only better with age