nothing special. i just wanna let u guys know that i have not encounter any problem with this setup for 4 months. i use 16 gauge amp wire to support the 175watt power inverter. 12v is getting power from 30amp wiper fuse (stock is 20amp), and ground is secured on one of the 10mm bolt under the steering column.

the other black wire connected to the 10amp meter fuse is my radar detector, which is also hardwired through the a-pillar to the top left of the windshield (hidden behind factory window's tint).

anywayZ i just wanna let u guys know that this setup is safe. and it is not necessary to hardwire 175watt (or less) power inverter from the battery.