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I just replaced the turbo gauge with the NA volt gauge and it is reading 10 volts. Anyone have an idea what is wrong?

I connected it to the positive that fed the turbo gauge and jumpered ground as shown in other posts.
 

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well...have you checked your actual electrical system voltage? I'd start there. Next, the needle position may be off, or you could have a faulty gauge.
 

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I fucked mine up by pulling the needle off and didn't put it back on correctly. What I'd do if I were you is get a good 12-volt battery and verify with a multimeter that it's sitting at 12 volts. Then pull the needle off the gauge, wire the gauge to the battery, and put the needle on at the 12 volts mark. It should then be properly calibrated.
 
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