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volt meter started to read 10 volts and drop down to 8 w/lights and accesories. stupid me didn't trust my brand new AutoMeter gauge because I had a ground problem earlier. Well woke up with a dead battery. Charged my battery started right up and now volt meter reads 12.x at idle and over 14 at...

I have a Sunpro mechanical oil pressure gauge, when the motor is off should the gauge still register pressure; or should the gauge indicate zero. If it is suppose to register zero, could someone help me calibrate it. Thanks