Go to www.DigirepGames.com and click the button that days: "download tracker (pdf)".
Scroll down a little and click: "print tracker (pdf)."
If your printer allows you to change any settings try to print it in black and white only, at 100% scale. If you can't change any settings no big deal.
Apply glue or double sided tape to both pieces of paper that you printed out and attach them to some cardboard.
Flatten the paper onto to the cardboard to make sure you have a good adhesion.
Now cut out the gun and the tracker along the dotted lines.
Once everything is cut out you should be left with 3 pieces.
Assemble the tracker as shown in the images below
Thats it your done.
Go play Stalk-VR.