Ties in your dash ABL LED's into the car's dash-lighting circuit. Dims with dash lighting. T-tap/solder or plug-n-play versions available. PnP version connects to four-pack gauge connector (all 5th gens so far have this). If you have a 2010 2LT/2SS with a VIN under A9160000, you can use the Splitter option.
Please let us know if you have a 2013 or newer. We have seen conflicting info on the connectors used for those years.