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My 90 Deville fuel data display run erratic. If I set it on instant MPG, it will show correctly, then it will cycle to miles left in tank and the other various settings, as if there was someone pushing the buttons. It seems to remain stable at certain speeds, then when accelerating a bit, it goes whacky again then comes to a stop at various readings. Anyone have any clues to this ghostly behaviour?

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Sure sounds like an intermittant connection. Wiggle things between the display and the BCM to see if anything changes. Also look for any damage tothe wiring harness. If it has rubbed against something, it could have an occasional short.
 
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