How do you.....

they are just 3inch lights....i havent put any in mine i just know cause of mishciefs car has 3inchers in his.......

as for the fuse thing.......


the fuse is just gonna protect your lights...if a surge of power happens to shoot through the wire or you get a short somewhere you wont lose your neons if they have a fuse........


autozone or someplace has little inline fuses that look like this one in the pic....

ok now the reason you might need it is if you are running your power straight from the battery or another power source that isnt already fused...........if you do it that way all you have to do is stick the fuseable link closest to the powersource you can..try and keep it no more than 12 inches from the power source...........

but you can check the fusebox in your dash and see if it has any open spots for extra accessories..........