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If you have aftermarket gauges, the oil will remain low unless the engine is being revved or moving under load, because the pump is not being spun. As for the lowered, vacuum, this is generally a result of the engine getting more air outside of the turbo, ie a boost leak. The ECU frying would have nothing to do with what conditions you are describing. Unless you have some sort of electric boost gauge, a mechanical boost gauge takes all it's readings directly from the source of vacuum attached at the base and monitors boost and vacuum mechanically.
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