You should go to your local pick and pull and find one from a 2000 and up taurus, SN95 mustang or Lincoln MKVIII preferably. The bad thing is that you need a good enough switch to make it work correctly. I like the dc control units but heard decent things about some of the other peices such as painless, black magic and be cool have out on the market.
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Ryan
1990 Mustang GT (In Process)
1993 LX Coupe (Daily Driver, but just choose not to)
2005 Excursion (Big Pig)