So I had the electrical redone on my 68 mustang about 15 years ago. I'm in process of putting a vintage USA electric dash in, while doing this I decided to replace the light switch. When I went to plug in the new switch it wouldn't fit. I did some research and found out that the switch plug was for a 64 mustang. So now I'm trying to fix the hack job these guys did but I'm stuck. There's a orange wire coming out the old plug, and I can't seem to figure out what it's for. And unfortunately the...

Light switch help