First you need to take your gauge cluster off your bike.
Then you need to take it apart, including desoldering the tach off. Or you could just take the needle off and remove the faceplate.
There are plenty of threads detailing the removal of the gauge cluster, and you could use the thread about changing the LEDs in the gauge cluster to pull it apart.
rubbing alcohol or some other type of adhesive remover
paper towels or lens wipes
Once you have your gauge cluster apart you should take the big LCD display off like this.
I started by taking the film off the big LCD display first. Using a razor I lifted a corner of the film up and once I get a big enough portion of it off I just rip it out by hand.
Again I did the same with the smaller display.
When you are done you will end up with 2 screens like this. Now comes the hard part of cleaning the gluey residue off.
I started the cleaning process by swabbing some rubbing alcohol on the LCD screen. Remember to work on them one at a time. Then with a razor blade I slowly scrape the glue off. (This is a long long process. I wish I had some 3M adhesive remover)
Once you scrape most of the glue off you should be able to grab some lens wipes and clean the rest of the residue completely clean. Alternatively you could just use paper towels dab with a little rubbing alcohol.
Now you need to cut the polarize film and fit them over the display. Here is an example of how the film works. Notice when I rotate the film it darkens over the LCD screens. Since the stock ones were glue on and the film I bought was none adhesive, I just cut them a tad big and jam them in there.