I want cruise control on my new 2005 cavalier 5 speed manual. I had it added at the dealer on my truck for $300. It works ok but not as good as the factory setup on my Malibu. I think the truck has a vaccuum system. ITs called global cruise. What are my options for the Cavalier? Ziebart says $400, the dealer says $250-500 depending on vaccuum or electric. What should I do? Are they hard to install by myself? Can I get a factory cruise switch (on the turn signal lever) and wire that into an aftermarket kit?