I bought that harness for my truck and it works great. I did convert to 12-volt and I have had zero issues. It does not take that long and it comes with pretty good directions. My advice though is take your time make all the connections perfect, make all your runs supported and well protected, heat wrap all the wires where they go into the connectors and when you are done you won't be sorry. Time to do it right is now because as we all know getting up under that dash is no fun.
