If i remember correctly this will work mostly but still be inaccurate since the game by default tracks the percentage wrong. I remember this cause Jbleezy when coding this into his mod had to re-code the entire thing since it gets horribly inaccurate values when starting and stopping. So just know this might work but probably isn't completely accurate and will probably say the percentage is much higher than the real number is the more you tap fire it.
Edit this is talking about jetgun and you can prove me wrong if you want I will take this all back if I am
@jossll
Download the mod from the Google Drive link, then extract the mod files. There's a folder called images. Grab all the .iwi files and place them in the "AppData\Local\Plutonium\storage\t6\images" path.
For the sounds, just find where you installed the game and add the missing files to the sound folder.