Hi to all

I have a few more questions. I have the diagram for the wiring set up. First is will any 12 volt relay work? Do you have to use the original kickdown switch or is there another switch that can be used? Is there something that works that can be obtained at a local electronics shop? If it has to be a kick down switch can I use one out of a ford or one of the other makes? I see them on ebay sometimes? or does it have to be specific to chevy? I have desided to try and set it up the original way.

Thanks Steve