white faced gauges

I just bought reverse white faced gauges for my 99 solara. I would like to know the easiest way to install them. It came with a power inverter and a black and red wire.

I would imagine the easiest way to install them would be to run them off the accessory fuse in the fuse box...and directly to the power inverter...unless they say there's a way you can wire them directly to your headlamp switch...but most of the junky ones I've seen online are ones you have to turn on seperate from your headlamps, and I think that's pretty lame...