[Gr1m]

hookup the positive/negative leads on the wire to the cubby hole light (under your HVAC controls) this way when your headlights automatically go on, the gauge overlays will automatically go on.

TO REMOVE:
two 8mm screws on the top hold the thing that goes around the gauges
then 4 more 8mm screws hold the gauges into the dash board.
unplug the large connector in the top right of the gauges and remove the entire assembly.
pry open the tabs all around the gauge to open the clear case and get into the actual gauge.
put the overlays in in place over the corresponding gauge.
(you might want to use some scotch tape to get the overlays to stay in the perfect spot, because they might move around like mine did with vibrations and bumps.)

reassemble and enjoy.