As far as being compatible with other systems, I'd check on anything added since production. Examples: wireless thermometers, remote A/C - thermostats,, GPS, Cell phones, I-Pods, and so on. Does engine running - not running have any influence? Any electronics inside that are close to camera or wire? Condition of the wire close to camera? I've herd of a ScanGauge II causing the screen to roll. Good luck
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