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under your dash in your ingnition wires you'll find a good ACCESORY wire to tap into. Your dimmer switch can be pulled from behind the radio, or by the button for the lights. always a good idea to fuse the power wire (in this case, between your ACC tap, and your guages)
another way to get a good ACC source, is to run an 8ga wire from the battery inside the car, and use a relay. use any small ACC wire to turn on the relay, then you can put quite a few ACC outlets off that relay, as long as you dont exceed the rating of the relay, usually 30a, if its a bosch relay. that gives you a good strong ACC source for multiple items. don't forget to fuse that 8ga with a 30amp fuse between the relay and the batt though.
good luck.
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