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Yeah, I agree. Vacuum is a PITA. You'll just be inviting more leaks (ever try to track down a vacuum leak?) and vacuum valves have their own sets of issues. Not to mention that loss of vacuum affects the engine directly.
Electric actually isn't bothered by the heat or vibration if done right, is smaller and is easier to diagnose if there is an issue. You already have to run electric for the vacuum actuator valve, so it would be easier to just ditch the vacuum idea.
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