I was looking into the same thing but I went the cheap way with a cassette adaptor for my iPod from Belkin after I looked at the price of integration cable and other things plus installation.
I think you can get it from Walmart for about $20. It is a cassette tape attached to a RCA jack that you plug into your Ipod and control your Ipod to play the music.
I tried the FM connector, it was pretty bad sound.
theres a site its call carstereohelp.com you can find the intsructions there but it cost like $5 for it . its pretty simple you just have to remove the air vent on top of the stereo it should just pop of then remove the little panel where your ashtray is at it'll pop off also then you'll see 2 srews on top and 2 on the bottom unsrew those 4 srews and out comes your stereo.