Quote:
Originally Posted by TBONE1964
Yes, the center upper stud is ground and the one on the left (in your photo from the back side)will get you battery voltage. I am not sure what the other stud is for myself but do know it will peg the gauge over to 18 volts if you apply 12 volts to it.
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Just in case anyone is wondering, that other stud (on the far right in lutronjim's first pic) is basically an intermediate connection point between the external resistor and the gauge's internal coil. If 12V is applied there, it bypasses the current limiting resistor and pegs the gauge.
Also, the stud on the left (the one that is used for the +V connection) does not have any direct internal connection to the gauge. It simply connects to one side of the resistor. So this arrangement puts the resistor in series with the gauge's internal coil.