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The cruise unit is in fact run by vacuum, and probably has a small T run from the top of the manifold to the control unit. If there's a small line disconnected, it's likely to that unit. Another small line will also run to the firewall for the heater controls, quite possibly from the same vacuum source on the manifold.
As for the bulb question, be sure to check out the 700/900 series FAQ available under "Features" above....
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Rob Bareiss, New London CT ::: '87 244DL/M47- 225K, 88 744GLE- 209K, 91 244 183K. Also responsible for the care and feeding of: 88 745GLE, 229K, 88 244GL, 146K, 87 244DL, 235K, 88 245DL, 236K
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