I took a different route. Instead of removing the tab on the switch i removed the plastic piece from the back of the knob. I took less than 2 minutes.
I took the route of cutting out some on the switch cap also.
Do this test first, It requires no cutting or modding.
Just remove the cap and turn the switch all the way to the left.
Pull the switch dial cap off of the switch (you may need to pull really hard but it will come off).
Turn the dial counter clockwise all the way.
If it goes one more click to the left, past the off position you have an auto position (that is auto).
When the switch is in auto the lights will come on with the ignition switch on (for those without the dash mounted photo sensor).
On my RT I have the sensor so I need the combination of the engine running and dark enough conditions for the auto lights to come on.
Do the following mod to the switch cap to enable this feature...
Examine the switch cap and the pitted area around the light switch on the dash.
Basically the switch cap needs to be able to turn to the left most "auto" position.
You can either remove the small little stop tab in the pit or cut some of the plastic off of the switch cap.
I hope this made sense for everyone. I just did this mod about 2 weeks ago.
Good Luck.