EDgun Edgun Leshiy Classic

Need to change out digital gauge to Huma analog. Any tutorials out there that I should check out? TIA
Break the action, to the left of the brass piece there will be a 2mm grub screw, slowly unscrew it and bleed out the air, DO NOT remove the grub entirely as there is a tiny ball bearing inside and you don't want to lose it. Once the air is bled tighten the screw and you can unscrew the buttstock, it should be a 5mm allen sizes screw. Once you remove that screw you'l be able to remove the stock, you might have to pry it a bit open to go over the small grub screw that's protruding from the airtube towards the back. You might be able to use your fingers to removed the air guage, other wise an adjustable wrench will work.