It's a bummer about the lack of live traffic support. FYI the original inline power cable for the newer Nuvis with traffic support also has an 1/8" input for a traffic antenna. I found out that Garmin actually sells a cable for this that you can either suction to your windshield or hide somewhere where it gets reception. Here is an
Amazon link for anyone interested. Unfortunately it won't work with the cable power kit you linked. You could probably make your own cable by stripping the wires on the end of the original Garmin cable, and then using the antenna extension to route the traffic antenna somewhere visible.
Great work on the DIY man, we really appreciate it! Repped.
Quick question, when you say "Garmin GPS devices with Live Traffic will show a power cable error when the device first starts up, but you can cancel this and use still use it for directions", does this mean the cable error comes up every single time the GPS powers up? I could see that getting annoying.