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Re: Should my volt meter read 0 when key is off?
he verified it's an aftermarket volt guage... so all this current talk is moot.
Turn off the ignition, verify your guage says 12 volts or so. Then, disconnect the battery. If it still stays on 12, then the guage is made to do this, like some (not all) tachs as mentioned before.
If it drops, then you'll need to find a switched source to feed the guage.
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