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If it is pegged at 30 (I assume 30" HG vacuum), are you sure you don't have 12V on the signal wire. Or maybe the ground on the signal wire? I believe it is the a 3 wire sensor, just like we use on engines at work.

I am pretty close to pulling the trigger on some SPeedhut gauges, and a vac/boost gauge is on the list. I think I would prefer a mechanical gauge as well, but I want all my gauges to match, and I don't think speed hut sells a mech version.
 
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