The reverse light is a very simple switch. Up by the gear selector there will be two wires that have contacts that correspond to when the gear selector is in reverse. These two wires get run into the engine bay and connected to the wires that go to the reverse switch. Very easy. I don't know about the cruise control stuff though.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.