The 5.2.2 cars (2.5L) used an external cruise control device. In the 7.2 and 7.8 cars the DME and instrument cluster, respectively controlled the cruise. Thus in the 7.2 and 7.8 cars you can just add the stalk and wires to the DME or cluster and activate the cruise control with a PST2 or PIWIS. This is what is explained on renntech.
-Todd
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Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
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