Driving light override switch
 

I wanted to install a switch under the dash so Id be able to switch the running lights on and off. I definately know how to do it the hard way (by running wires through the firewall), but I'd much rather put a switch into preexisting wire thats connected to the ignition. How would I do that? Thanks in advance.
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Which year vehicle (and for that matter, which vehicle) do you own ?? Unlike some things, it do make a difference .....