volt gauge install

[93Z]

I'm installing a glowshift volt gauge in my Z but i need a little help with the wiring. There are 3 wires: a constant 12 volt, a switched 12 volt, and a ground. I need to know where to hook up each. Also i bought an Add a circuit piece that goes into the fuse panel. Thanks

[chaunceysj]

i put one in but i ran one without a light so it was just power wire to a switch. then power wire from the switch to the gauge, then ground to the other tab on the gauge. worked fine.