how to wire toggle swtich

3 prong will let you have 12v power in - A or R is for accessory/remote(middle prong) and then Ground. Power wire from your battery bank to 12v in, power wire from your volt meter to the accessory/remote(middle prong) and then ground that volt meter. Then ground wire from your toggle switch to a ground.

 
3 prong will let you have 12v power in - A or R is for accessory/remote(middle prong) and then Ground. Power wire from your battery bank to 12v in, power wire from your volt meter to the accessory/remote(middle prong) and then ground that volt meter. Then ground wire from your toggle switch to a ground.
ok thanks im try this out

 
You want a switch to turn the meters on and off? You could just run the red wires to a switched ignition wire in your car, and the white wires to where you want to measure. Black to ground. No switch required.

If you want a rocker switch anyway, just put it between your switched ignition power and the red wires on the meters.

 
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